model t21888 2.5 hp,
6.3 gallon compressor
instruction manual
Copyright © FEBrUAry, 2010 By grizzly indUstriAl, inC.
Warning: no portion of this manual may be reproduced in any shape
or form Without the Written approval of grizzly industrial, inc.
For modEls mAnUFACtUrEd sinCE 02/10 #Cr12612 printEd in ChinA
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table of contents
introduction.....................................................................................2
Foreword...........................................................................................2
specifications....................................................................................2
Additional safety instructions for Air Compressors ..........................5
section 1: circuit reQuirements ..............................................6
110V operation.................................................................................6
section 2: set up..............................................................................8
Unpacking.........................................................................................8
Assembly ..........................................................................................8
placement.........................................................................................8
test run & Break in .........................................................................9
section 3: operations .................................................................10
pressure regulator Use .................................................................10
operation ........................................................................................11
Accessories.....................................................................................12
section 4: maintenance...............................................................13
schedule.........................................................................................13
draining tank..................................................................................14
pressure relief Valve test .............................................................14
section 5: service .........................................................................15
troubleshooting ..............................................................................15
Changing oil ...................................................................................18
Check Valve....................................................................................18
Fixing Air leaks ..............................................................................19
pressure switch..............................................................................20
storage ...........................................................................................21
parts Breakdown.............................................................................22
parts list.........................................................................................23
Warranty .........................................................................................24
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introduction
foreword
specifications
the specifications, details, and photo-
graphs in this manual represent the model
t21888 as supplied when the manual was
prepared. however, owing to grizzly’s pol-
icy of continuous improvement, changes
may be made at any time with no obliga-
tion on the part of grizzly.
motor hp ..........................................21⁄2 hp
motor Voltage/Cycle..................110V/60hz
motor Amperage...................................15A
power Cord ..........................................15A
tank size ......................................6.34 gal
length....................................................22"
3
Width ................................................. 13 ⁄4
"
height ....................................................22"
sCFm at 40 psi ........................... 4.9 CFm
sCFm at 90 psi .............................. 4 CFm
max. Air pressure.......................... 115 psi
Cut-in Air pressure.......................... 85 psi
Cut-out Air pressure..................... 115 psi
pressure relief Valve.................... 130 psi
shipping Weight ................................63 lbs
machine Weight.................................55 lbs
if you have any comments regarding this
manual, please write to us at the following
address:
grizzly industrial, inc.
C/o technical documentation
p.o. Box 2069
Bellingham, WA 98227-2069
E-mail: manuals@grizzly.com
most importantly, we stand behind our
tools. if you have any service questions or
parts requests, please call or write us at
the location listed below.
no list of safety guidelines is com-
plete, because every work environ-
ment is different. always consider
safety first and use common sense.
failure to use this tool with caution
and respect could result in serious
personal injury.
grizzly industrial, inc.
1203 lycoming mall Circle
muncy, pA 17756
phone: (570) 546-9663
Fax: (800) 438-5901
E-mail: techsupport@grizzly.com
Web site: http://www.grizzly.com
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safety
for your own safety read instruction manual
before operating this equipment
the purpose of safety symbols is to attract your attention to possible hazard-
ous conditions. this manual uses a series of symbols and signal words which
are intended to convey the level of importance of the safety messages. the
progression of symbols is described below. remember that safety messages by
themselves do not eliminate danger and are not a substitute for proper accident
prevention measures.
indicates an imminently hazardous situation which,
if not avoided, Will result in death or serious injury.
indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
indicates a potentially hazardous situation which, if
not avoided, may result in minor or moderate injury.
it may also be used to alert against unsafe practices.
this symbol is used to alert the user to useful informa-
NOTICE
tion about proper operation of the equipment.
safety instructions for pneumatic tools
1. read this manual. this tool may
cause personal injury if used incor-
rectly. this manual contains proper
safety and operating instructions that
must be followed to reduce this risk.
2. Wear eye protection. this
tool may throw small fragments dur-
ing operation, which may cause seri-
ous eye injury. Always wear Ansi
approved safety glasses or face shield
to reduce your risk from this hazard.
3. Wear a respirator. this tool
may produce fine dust during opera-
tion, which can cause respiratory inju-
ry if inhaled. Always wear a respirator
niosh approved for the type of mate-
rial being processed.
4. Wear hearing protection.
operating this tool for prolonged time
periods may damage your hearing.
your risk depends on length and fre-
quency of use. to reduce your risk of
this hazard, wear hearing protection.
5. maintain safety guards. your
tool may be equipped with safety
guards or other structural components
designed to reduce the risk of injury
during operation. never modify or
operate this tool with any guards or
components removed or damaged.
6. Keep children aWay. prevent
children from injury by keeping them
away from this tool. disconnect and
lock the tool away when not in use.
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7. avoid entanglements. do not
wear loose clothing, gloves, neck-
ties, rings, bracelets, or other jew-
elry, which may get caught in moving
parts, when operating this tool. Wear
a protective hair covering to contain
long hair.
8. use correct air pressure.
Exceeding the maximum psi rating
of this tool may cause unpredictable
operation or bursting.
9. disconnect air pressure
before servicing, changing acces-
sories, or moving to another loca-
tion. never leave this tool unattended
when connected to air.
10. secure tooling. Always verify
tooling is secure before operation.
11. sharp surfaces. do not place
hands near the tooling surfaces when
in operation.
12. remove adJusting Keys and
Wrenches after use. these
tools become dangerous projectiles if
left on the tool when it is started.
13. avoid flammables. do not use
this tool around any flammables that
may be ignited by sparks.
14. secure WorK. Use clamps or a
vise to hold work when practical. it is
safer than using your hand and frees
both hands to operate tool.
15. maintain tools With care.
Keep tools lubricated and clean for
best and safest performance. Follow
instructions for lubricating and chang-
ing accessories.
16. do not force tool. it will do
the job better and safer at the rate for
which it was designed.
17. checK for damaged parts
before using. Check for bind-
ing and alignment of parts, broken
parts, part mounting, loose bolts, and
any other conditions that may affect
operation. repair or replace dam-
aged parts before operating.
18. use good lighting. Keep work
area well lighted. dark work areas
increase risk of accidental injury.
19. avoid
unintentional
operation. Always disconnect air
when not in use, and do not carry tool
with hand on trigger.
20. use
the
recommended
accessories. Consult owner’s
manual for recommended acces-
sories. Using improper accessories
may increase the risk of injury.
21. never alloW untrained
users to use this tool While
unsupervised.
22. if you are unsure of the
intended operation, stop
using tool. seek formal training
or research books or magazines that
specialize in pneumatic tools.
23. be aWare of hose location.
hoses can easily become a tripping
hazard when laid across the floor in
a disorganized fashion.
24. do not use under the
influence of drugs or
alcohol, or When tired.
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additional safety instructions
for air compressors
4. air line and poWer cord
safety. ruptured air lines or severed
electrical cords can blind or electrocute
you. make sure your air hose has a psi
rating that exceeds the maximum psi
of your compressor, is in good condi-
tion, and is long enough to reach your
work without stretching. make sure the
power cord does not come in contact
with sharp or abrasive objects.
1. tanK safety. metal from explod-
ing air tanks can kill or severely maim
you or bystanders. drain the tank
after each use to prevent corrosion
and possible tank rupture. inspect
the tank for unsafe conditions such
as rust, pin holes and cracks. nEVEr
weld or drill new ports in an air tank.
nEVEr adjust safety valve or pres-
sure switch to allow the compressor
to build higher psi than rated. Keep
pressure relief valve free of paint and
dirt, and manually test it often.
5. air nozzle. Compressed air can
break the skin, or enter the blood-
stream through soft tissue, and cause
a stroke or death. never aim an air
nozzle directly at yourself or others.
2. compressed air use. Using air
from this compressor can be poison-
ous if used for breathing or for filling
diving tanks, or if used for pharma-
ceutical, food, or health applications.
only use this compressor to operate
shop or construction air tools.
6. unplug compressor. storing or
leaving a compressor while it is plugged
in can cause fire. if a leak develops, the
compressor may run continuously until
it overheats and catches fire. Always
disconnect a compressor from power,
drain the tank air, and disconnect the
air hose.
3. avoid burns. the motor and air
supply pipe get hot and can cause
burns if touched. do not touch
these compressor parts if the unit
has been running within the last 30
minutes.
no list of safety guidelines can
be complete. every environment is
different. always consider safety
first, as it applies to your individ-
ual working conditions. use this
and other machinery with caution
and respect. failure to do so could
result in serious personal injury,
damage to equipment or poor work
results.
there is danger associated with the
use of air compressors. accidents
are frequently caused by lack of
familiarity or failure to pay atten-
tion. use this air compressor with
respect and caution to lessen the
possibility of operator injury. if nor-
mal safety precautions are over-
looked or ignored, serious personal
injury may occur.
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section 1: circuit
reQuirements
110v operation
electrocution or fire
could result if this
machine is not ground-
ed correctly or if your
electrical configura-
tion does not comply
with local and state
codes. ensure compli-
ance by checking with
a qualified electrician!
serious personal injury could occur
if you connect the machine to the
power source before you have com-
pleted the set up process. do not
connect the machine to the power
source until instructed to do so.
amperage draw
the motor on your air compressor will
draw the following amps:
plug/receptacle type
plug type ..............nEmA 5-15 (figure 1)
motor draw..................................15 Amps
Grounding Prong is
Longest of the Three
Prongs
circuit requirements
the power supply circuit for your machine
mUst be grounded and rated for the
amperage given below. never replace a
circuit breaker on an existing circuit with
one of higher amperage without consulting
a qualified electrician to ensure compli-
ance with wiring codes. if you are unsure
about the wiring codes in your area or you
plan to connect your machine to a shared
circuit, consult a qualified electrician.
Current
Grounded
Outlet
Carrying Prongs
figure 1. typical type 5-15 plug and
receptacle.
minimum Circuit requirement..... 20 Amp
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grounding
in the event of an electrical short, ground-
ing reduces the risk of electric shock. the
grounding wire in the power cord must be
properly connected to the grounding prong
on the plug; likewise, the outlet must be
properly installed and grounded. All elec-
trical connections must be made in accor-
dance with local codes and ordinances.
extension cords
to reach the work area, use additional
air hoses instead of extension cords. the
use of extension cord with a compressor
can cause the cords to overheat, catch
fire, or reduce power to the compressor
motor, and cause the compressor motor to
overheat and fail. locate the air compres-
sor where it can be plugged into an outlet
without the use of an extension cord.
this machine must have a ground
prong in the plug to help ensure
that it is grounded. do not remove
ground prong from plug to fit into a
two-pronged outlet! if the plug will
not fit the outlet, have the proper
outlet installed by a qualified electri-
cian.
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section 2: set up
3. remove the oil fill cap (figure 3) on top
unpacking
of the crankcase and add air compres-
sor oil into the hole. When full, the oil
level should be in the center of the sight
glass.
your air compressor left our warehouse
carefully packed. if you discover the air
compressor is damaged after you have
signed for delivery, please immediately
call Customer Service at (570) 546-9663
for advice.
oil Fill
Cap
save the container and packing materials
for possible inspection by the carrier or its
agent. otherwise, filing a freight claim can
be difficult.
assembly
sight glass
figure 3. oil cap and sight glass location.
to assemble the air compressor:
placement
1. remove all packing materials and any
protective plastic bags and tags from
the compressor.
place the compressor on a stable and
level surface in a clear and well ventilated
area to prevent the motor from overheat-
ing. When using the compressor at a job
site or any other location, make sure that
an adequate and properly fused power
supply is available for this machine. do not
use extension cords with this machine.
2. rotate the air filter cap clockwise to
make sure the air filter is attached to the
cylinder head, as shown in figure 2.
the contacts of the compressor pres-
sure switch spark when cycling the
compressor motor on and off. if any
flammable gases are near the switch,
ignition and explosion may occur,
resulting in severe burns or death.
never place the compressor next
to flammable liquids, gases, or in a
paint spraying or gluing booth.
Air Filter Cap
figure 2. Air filter attached to
cylinder head.
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6. observe the tank pressure gauge
(figure 6) to verify that the tank pres-
sure climbs to approximately 105-110
psi. When the tank reaches this pres-
sure, the motor will automatically shut
OFF.
test run &
break in
to test run and break in the air com-
pressor:
note: If the compressor reaches 115-
120 PSI, and does not automatically
shut OFF, lift the ON/OFF lever up to
shut the motor OFF before the pressure
climbs any higher. Adjust the pressure
switch as outlined on Page 20.
1. put on safety goggles, and place the
compressor on a solid, level surface.
2. make sure the on/off lever is in the
up or the OFF position, as shown in
figure 4.
tank
pressure
on/oFF lever
pressure
relief
Valve
figure 6. tank pressure relief valve and
tank pressure gauge.
figure 4. on/oFF lever.
3. double check the oil level sight glass to
make sure the crankcase oil is at the full
mark.
7. put on your hearing protection, and
make sure that you are still wearing
your safety goggles and complete the
pressure relief valve test on page
14.
4. Connect the compressor to the power
supply.
8. For the final load break in, use the com-
pressor as normal, but after approxi-
mately 30 minutes of actual use (not
including the cool-down times), change
the compressor oil, as outlined in
changing oil on page 18.
5. leave the drain valve (figure 5) open,
push the switch to the down position
or the ON position, and allow the com-
pressor to free-run for 15 minutes for
a no-load break in before closing the
drain valve and allowing it to build air
pressure.
Knurled
Knob
figure 5. drain valve.
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section 3: operations
pressure
regulator use
the tank pressure is displayed on the
pressure gauge that is closest to the
pressure relief valve shown in figure 6,
and the air to be delivered to the tool is
displayed on the pressure gauge adjacent
read the manual before operation.
become familiar with this tool, its
safety instructions, and its operation
before beginning any work. serious
personal injury may result if safety or
operational information is not under-
stood or followed.
to the on/oFF lever.
the air tool that you attach to the air com-
pressor may have a maximum pressure
rating. if a psi limit is required, adjust the
air regulator to meet this requirement.
to control the air supply to your tool:
1. Adjust the regulator knob, shown in
figure 7, to set the psi that will be
delivered to your tool. turn the knob
clockwise to increase the pressure or
counterclockwise to decrease the pres-
sure.
eye/ear inJury
hazard!
Wear protective
equipment when
using this tool.
accidental
start hazard!
disconnect before
service or tool
changes.
regulated-Air side
lock ring
tank-Air side
and regulator
Knob
air pressure
hazard!
never exceed max
psi rating for tool.
figure 7. regulator controls.
2. rotate the lock ring shown in figure 7
against the bottom of the air regulator
knob to prevent compressor vibration
from changing the knob position and air
pressure setting.
draining the air from the tank will be
extremely loud and debris may be
blown into your eyes from the floor.
Wear safety glasses and ear protec-
tion when draining the tank.
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to use your air compressor:
1. put on safety glasses.
operation
2. make sure the compressor lever is in
the down or the OFF position, as shown
in figure 9.
leaving
a
compressor while it is
plugged in can cause fire. if a leak
develops, the compressor may run
continuously until it overheats and
catches fire. When not in use, always
disconnect the compressor from
power, and drain the air tank.
on/oFF lever
Before connecting an air tool to this air
compressor, have a general idea as to
what the CFm (Cubic Feet per minute) air
requirement is for your tool. if the tool has
a CFm requirement higher than what the
compressor can supply, the tool will oper-
ate poorly. Additionally the compressor will
likely run continuously to keep up with the
demand and overheat possibly causing
damage. however, the model t21888 is
equipped with a thermal overload. When
the core temperature of the motor reaches
an unsafe level, the thermal overload will
trip open and cut power to the motor.
figure 9. on/oFF lever.
3. Close the tank drain valve.
4. double check the oil level sight glass
shown in figure 10 to make sure the
crankcase oil is at the full mark.
sight glass
if the thermal overload trips, the compres-
sor must be allowed to cool for 30 minutes,
then you can push the reset button shown
in figure 8, and resume operations.
figure 10. sight glass location.
5. Connect the compressor to the power
supply.
in the future, do not allow the compressor
to constantly run and overheat.
6. Connect the tool air hose to the com-
pressor.
thermal
overload
reset
the right-hand connection point pro-
vides full tank pressure with minimum
air restrictions. the gauge above the
fitting shows full tank pressure.
the left-hand connection point pro-
vides regulated air pressure. the gauge
above the fitting shows the pressure
level being delivered to the tool.
figure 8. thermal overload reset.
model t21888 (mfg. since 2/10)
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h7274—campbell hausfeld™ pressure
regulator
accessories
since psi drops through lengths of air
hose, attaching a regulator directly to the
spray gun ensures accurate air regulation
for the best results possible. provides
regulated output pressure of 0 to 125 psi
for proper tool operation. locking pressure
knob prevents accidental adjustments. 15
sCFm flow capacity @ 90 psi. 1⁄4" npt.
g6261—campbell hausfeld™ Water
filter
Filtering out water and oil before it reaches
the spray gun is critical for high quality
spraying results. this filter is rated at 150
psi maximum air pressure, and has a ⁄4
npt air inlet.
1
"
figure 13. h7274 Campbell hausfeld™
pressure regulator.
figure 11. g6261 Campbell hausfeld™
water filter.
h3275—1⁄4" npt x 25' recoil hose
h3276—1⁄4" npt x 50' recoil hose
these recoil hoses are great dedicated air
hoses because they are extremely light
weight and maneuverable, which makes
hours of spraying less tiring on wrists and
arms.
g8114—3⁄8" x 25 ft. air hose
g8115—3⁄8" x 50 ft. air hose
g8116—3⁄8" x 100 ft. air hose
We recommend dedicating an air hose for
spraying use only, keeping it clean and
free of water and oil by using a filter on the
incoming end. multi-purpose red rubber
air hose is flexible and abrasion resistant.
Features 200 psi rating, 800 psi bursting
1
strength, and ⁄4" npt ends.
figure 14. h3275 Coil hose.
figure 12. red rubber air hose.
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section 4: maintenance
Weekly
schedule
if used daily, perform the following com-
pressor checks each week, otherwise
check these items once a month:
1. remove and blow out the air filter
(figure 15) from the inside out, then
re-install.
operating this equipment has the
potential to cause eye injury and
hearing loss. always wear eye and
ear protection when operating an air
compressor. be certain the safety
protection you wear meet the appro-
priate standards of the american
national standards institute (ansi).
figure 15. Air filter element.
2. Check for loose bolts or fittings.
daily
3. Clean off all dirt and dust from the cylin-
der head, motor, fan, air lines, exhaust
pipe, couplers and frame.
daily before use, perform the following
checks:
4. Check air lines and connectors to make
sure they are in good condition.
1. look at the sight glass on the crank-
case and make sure it is filled with oil to
the correct level.
5. pull the pressure relief valve ring to
make sure the valve is not stuck closed.
refer to draining tank on page 14 for
details.
2. Check for worn or damaged electri-
cal cords and plugs. inspect air hose
for abrasions and evidence of pending
hose burst.
3. drain the condensation from the tank
when finished using the air compressor,
and leave the drain valve open until the
next use. For details refer to draining
tank on page 14.
the air compressor will turn ON auto-
matically when it is set on auto.
When performing maintenance make
sure the auto/off lever is in the
off position, the compressor is
unplugged, and the air pressure has
been bled out of the tank.
4. inspect and correct any other unsafe
condition.
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Quarterly
after every approximately 300 run-time
hours, or 3 months, perform the follow-
ing maintenance:
pressure relief
valve test
1. Change the oil in the air compressor
pump as described in changing oil on
page 18.
the pressure relief valve prevents the air
tank from exploding should the compres-
sor keep building air pressure and not
shut off automatically. the safety valve
is preset at the factory and must not be
tampered with.
2. Check for air leaks and correct as
needed.
draining tank
unseating the pressure relief valve
will be extremely loud and debris
may be blown into your eyes from the
floor or the valve. Wear safety glass-
es and ear protection when draining
the tank.
Water will accumulate in the tank depend-
ing on usage and humidity. drain water
from the tank daily to increase the lifespan
of the compressor and air tools.
to check the pressure relief valve:
draining the air from the tank will be
extremely loud and debris may be
blown into your eyes from the floor.
Wear safety glasses and ear protec-
tion when draining the tank.
1. Clean any dirt or dust from the pressure
relief valve shown in figure 17.
2. Allow the air compressor to build full
pressure.
to drain water from the tank:
1. put on safety goggles and hearing pro-
tection.
2. leave the tank pressurized and turn
the knurled knob shown in figure 16
counterclockwise to drain the water.
pressure
relief Valve
figure 17. pressure safety valve.
3. pull and release the metal ring on top of
the safety valve to unseat the valve and
to ensure the valve will release air. the
pressure safety valve must be replaced
if it cannot be pulled, or if it leaks after
releasing pressure.
Knurled
Knob
figure 16. tank drain valve.
-14-
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section 5: service
this section is provided for your convenience—it is not a substitute for the grizzly service
department. if you need help troubleshooting, replacing parts, or you are unsure of how
to perform the procedures in this section, then feel free to call our technical support at
(570) 546-9663.
troubleshooting
symptom
possible cause
possible solution
motor will not start.
1. tank already pressurized. 1. motor will not start if tank
is fully pressurized.
2. thermal overload switch
has tripped.
2. Wait 30 minutes for motor
to cool, then push reset.
3. start capacitor is at fault. 3. replace start capacitor.
4. short circuit in motor or
cord, or loose connec-
tions.
4. inspect and repair all
connections on motor for
loose or shorted termi-
nals or worn insulation.
5. replace or adjust the
pressure switch (page
20).
5. pressure switch is bad.
6. thermal overload tripped. 6. push in reset button.
7. motor is at fault.
7. replace motor.
motor overheats and
thermal overload turns
motor OFF.
1. Compressor and motor
have restricted air flow.
2. Air filter clogged.
1. Clean cylinder fins, motor
fan, and vent area.
2. inspect and clean air fil-
ter.
3. thermal overload switch
has tripped.
3. reduce load on com-
pressor and allow longer
cool down periods.
loud repetitious noise
coming from air com-
pressor.
1. motor fan is hitting the
cover.
1. Adjust fan cover mount-
ing position, tighten fan,
or shim fan cover.
Compressor knocking.
1. improper oil level.
2. Air filter clogged.
1. Check oil level and add
oil (page 20).
2. inspect and clean air fil-
ter.
3. piston assembly loose.
3. inspect and repair piston
and connecting rod.
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symptom
possible cause
possible solution
Air leaks from pressure
switch.
1. Faulty check valve.
1. repair the check valve
(page 18).
2. Faulty pressure switch.
2. replace pressure switch.
low pressure at the
tank, or tank pressure
drops after compressor
is turned OFF.
1. Air leaks in tanks or deliv- 1. Check air tank, pipes and
ery pipes.
all connections for leaks.
2. Close drain valve.
3. inspect and clean air fil-
ter.
2. drain valve open.
3. Air filter clogged.
4. pressure switch turns the 4. Adjust the pressure
motor OFF too soon.
5. leaking check valve.
switch (page 20).
5. repair the check valve
(page 18).
6. pressure relief valve
releasing below 110 psi.
7. gaskets leaking.
6. replace pressure relief
valve.
7. Check gaskets on cylin-
der head assembly, repair
or replace as needed.
8. inspect and replace pump
piston rings.
8. Worn rings.
pressure relief valve
stays open and motor
won’t stop running.
1. pressure switch adjusted
too high.
2. Faulty pressure switch,
unit is trying to overpres-
sure the tank.
1. Adjust the pressure
switch (page 20)
2. turn compressor oFF,
unplug from power sup-
ply, and empty tank.
do not UsE until switch
is replaced.
3. Faulty pressure relief
valve.
3. relief valve is reliev-
ing pressure too early.
replace pressure relief
valve.
Air tool has low supply
pressure but compres-
sor has sufficient air
pressure.
1. in-line filter is damaged
or clogged (if used).
2. in-line water separator is
full (if used).
1. replace filter or in-line
filter assembly.
2. drain water separator.
3. pressure regulator.
3. Adjust pressure regula-
tor, if no improvement,
inspect regulator for leaks
or replace.
4. Air leaks in hoses.
4. Check air hoses and all
connections for leaks .
5. replace the pressure
gauge.
5. pressure gauge bad.
6. pressure switch turns the 6. Adjust the pressure
motor OFF too soon.
switch (page 20).
-16-
model t21888 (mfg. since 2/10)
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symptom
possible cause
possible solution
Air is dirty or has exces- 1. tank is not drained.
sive moisture.
1. open drain valve and
make certain all the water
is drained out.
2. delivery pipes are dirty.
2. remove delivery pipes,
clean out and replace.
Air tools have oily dis-
charge.
1. Compressor tank need
draining.
1. drain compressor tank
(page 14).
2. Compressor crankcase is 2. drain and return oil level
over full with oil.
3. in-line oiler is out of
adjustment (if used).
to normal (page 8).
3. Adjust in-line oiler drip
ratio or use correct vis-
cosity oil for in-line oiler.
4. replace filter or in-line
filter assembly.
4. in-line filter is damaged
or missing (if used).
5. incorrect viscosity of oil
in the crankcase.
5. Crankcase oil is too light,
replace with actual com-
pressor oil.
6. Compressor is at fault.
6. Worn compressor piston,
rings, or valves. rebuild
or replace compressor.
Air tools have watery
discharge or get cold
and freeze up with ice
during use.
1. Compressor tank needs
draining.
2. Ambient environment has 2. install in-line air dryer
too much humidity.
3. in-line water separator is
full (if used).
1. drain compressor tank
(page 14).
and water separator.
3. drain water separator.
Compressor does not
build air pressure, or
does not reach full pres-
sure.
1. Air leaks in tanks or deliv- 1. Check air tanks, pipes
ery pipes.
and all connections for
leaks.
2. drain valve open.
3. Air filter clogged.
2. Close drain valve.
3. inspect and clean air fil-
ter.
4. leaking check valve.
4. repair the check valve
(page 18).
5. reed valves not sealing.
5. remove cylinder head
and replace reed valves.
6. remove head and
replace gaskets.
7. inspect and replace pis-
ton rings.
6. head gasket or valve
body gasket leaking.
7. Worn rings.
8. Broken crank shaft or
connecting rod.
8. replace or rebuild com-
pressor.
-17-
model t21888 (mfg. since 2/10)
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5. reinstall the drain plug, and remove the
oil fill cap shown in figure 18.
changing oil
6. Fill the crankcase with oil until the oil
level is in the center of the sight glass,
then replace the oil fill cap.
Change the oil in the air compressor pump
after the initial 50 hours, or 30 days of use;
and every 300 hours, or 3 months after
the first oil change. Use any quality air
compressor oil.
NOTICE
the oil fill cap releases crankcase
pressure through a small hole in
the top of the cap. Keep this hole
unclogged, or the crankcase may
pressurize, causing seals and gas-
kets to leak leading to compressor
bearing failure.
to change the oil:
1. disConnECt thE ComprEssor
From poWEr, And drAin All Air
From thE tAnK.
2. place a container to catch the oil under
the oil sight glass.
check valve
hot crankcase oil can scald your
hands or fingers. before draining the
oil, allow the compressor to cool 15
minutes before removing the drain
plug.
the diaphragm and seal in the check valve
can become damaged, twisted, or dirty
and cause the valve to leak or prevent the
compressor from building air.
to fix the check valve:
3. Using a 19mm wrench, remove the
drain plug shown in figure 18.
1. disConnECt thE ComprEssor
From poWEr, And drAin All Air
From thE tAnK.
oil Fill Cap
drain plug
2. Using a 19mm wrench remove the cap
shown in figure 19 from the check
valve.
Cap
figure 18. drain plug and oil fill cap.
4. tip the compressor to drain all of the oil
from the crankcase.
Check Valve Assembly
figure 19. Check valve assembly.
-18-
model t21888 (mfg. since 2/10)
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3. inspect the seal ring and diaphragm
(figure 20) for damage and dirt.
fixing air leaks
diaphragm
to find air leaks:
1. Allow the compressor to build air pres-
sure to the rated pressure.
2. disConnECt thE ComprEssor
From poWEr.
3. listen for the sound of air to find fittings
that may be leaking.
4. spray the suspected air leak with a
soap and water solution. if you see air
bubbles, you have found your leak.
seal
ring
to fix air leaking around fitting threads:
1. disConnECt thE ComprEssor
From poWEr, And drAin All Air
From thE tAnK.
figure 20. Check valve assembly.
4. replace any damaged parts and clean
any dirt off of the diaphragm and seal
ring.
2. Unscrew the fitting that is leaking.
5. re-assemble the check valve. do not
add thread sealant or teflon tape to
the cap threads, as the seal ring is the
seal.
3. Clean and apply teflon tape or liquid
thread sealant to the fitting threads.
4. Clean and chase the threads with the
appropriate thread tap.
6. make sure the diaphragm presses
squarely against the air supply tube
opening.
5. re-install the fitting to the compressor.
-19-
model t21888 (mfg. since 2/10)
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if only the maximum tank pressure
needs to be adjusted, then turn the
cut-out adjustment screw (figure 22)
a half turn clockwise to increase the
tank pressure, or a half turn counter-
clockwise to decrease the tank pres-
sure. the cut-in setting will remain
unchanged. however, keep in mind
that the allowable pressure differential
between the cut-in pressure and cut-out
pressure must be kept between 30-40
psi. Exceeding this range can cause
the compressor to overheat.
pressure switch
the pressure switch ensures the compres-
sor will turn ON (cut-in) when the tank
pressure drops to approximately to 85 psi.
the compressor will shut OFF (cut-out)
when the air tank reaches maximum of
115 psi. should the cut-out switch fail, the
pressure relief valve will open at 130 psi,
preventing tank explosion.
NOTICE
Cut-out
Adjustment
only
Cut-in and
Cut-out
Adjustment
the cut-in and cut-out settings have
been factory set at the proper psi
range. only adjust the pressure
switch if your air compressor is cut-
ting-in or cutting-out at the incorrect
pressures.
to adjust the pressure switch:
figure 22. pressure adjustment screws.
1. operate compressor and record com-
pressor cut-in and cut-out pressures.
if the minimum and maximum tank
pressure settings both have to be raised
or lowered at the same time, then the
cut-in and cut-out adjustment screw
must be adjusted. turn the cut-out
adjustment screw (figure 22) a half
turn clockwise to increase both pres-
sure settings or a half turn counterclock-
wise to decrease both settings.
2. disConnECt thE ComprEssor
From poWEr, And drAin All Air
From thE tAnK.
3. make sure the compressor switch is in
the oFF position.
4. Using a #2 phillips screwdriver, remove
the switch cover shown in figure 21
and hinge back the cover and set it
aside.
5. reinstall the cover, connect the com-
pressor to the power supply, and start
the compressor. Cycle the compressor
through the cut-in and cut out pres-
sures. if the compressor does not auto-
matically turn OFF at 115 psi, flip
the on/oFF switch to oFF before the
pressure reaches 120 psi. if the tank
pressure is too high, or any settings are
out of specification, readjust the pres-
sure switch until all are correct.
figure 21. pressure switch cover.
-20-
model t21888 (mfg. since 2/10)
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storage
Water will condense in the air com-
pressor tank when the compressor
is in operation. Water left in the tank
can cause the tank to weaken and
corrode, increasing the risk of tank
rupture.
When storing your air compressor, fol-
low these guidelines:
1. push the compressor on/oFF lever
down to the oFF position.
2. disconnect the compressor from
power.
3. Unplug the compressor.
4. run the air tool to relieve the air pres-
sure in the hose, then remove the air
hose and the tool.
5. drain water from the tank as instructed
in draining tank on page 14. leave
the valve open until the next usage.
always disconnect the air hose from
tools whenever not in use or while
6. store the air compressor in its normal
operating position in a dry and pro-
tected area.
servicing! during maintenance,
a
tool connected to air may operate
accidentally, causing serious per-
sonal injury!
failure to unplug the air compres-
sor before storage may result in the
compressor running continuously,
causing overheating, damage to the
compressor, and possibly a fire.
-21-
model t21888 (mfg. since 2/10)
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parts breakdown
35
36
33
32
31
30
29
40
37
34
41
42
10
38
39
28
25
46
27
11
26
24
23
22
21
43
20
56
19
18
17
16
15
63
62
63
58
51
14
13
12
9
53
52
54
2
1
3
4
59
61
5
60
86
87
55
6
7
45
8
64
87
65
86
66
88
82
44
81
67
68
74
73
83
84
72
89
76
71
70
69
77
78
79
80
-22-
model t21888 (mfg. since 2/10)
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parts list
REF PART #
DESCRIPTION
REF PART #
DESCRIPTION
1
PT21888001 CRANKCASE
42
43
44
45
46
51
52
53
54
55
56
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
76
77
78
79
80
81
82
83
84
86
87
88
89
PW02M
FLAT WASHER 5MM
2
PT21888002 CRANKSHAFT
PT21888003 CONNECTING ROD
PT21888004 CONNECTING ROD BOLT
PT21888005 COVER GASKET
PT21888006 CRANKCASE COVER
PT21888007 GASKET
PT21888043 MOTOR 110V
3
PT21888044 HOT PIPE WARNING LABEL
PT21888045 LUBRICATION LABEL
PT21888046 S CAPACITOR 110M 250V W/STUD
4
5
6
PFB30M
PW01M
PS21
FLANGE BOLT M8-1.25 X 30
FLAT WASHER 8MM
PHLP HD SCR 8-32 X 3/4
LOCK WASHER 8MM
HEX NUT M8-1.25
7
8
PT21888008 SIGHT GLASS
9
PS02M
PT21888010 THERMAL OVERLOAD 15A
PLW02M LOCK WASHER 4MM
PHLP HD SCR M4-.7 X 12
PLW04M
PN03M
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
PT21888056 PRESSURE SWITCH LF10-1H
PT21888058 MANIFOLD
PT21888012 VENTED FILL CAP
PT21888013 WRIST PIN RETAINER
PT21888014 WRIST PIN
PT21888059 PRESSURE RELIEF VALVE 130 PSI
PT21888060 QUICK DISCONNECT 1/4" NPT
PT21888061 AIR REGULATOR
PT21888062 PLASTIC PLUG
PT21888015 PISTON
PT21888016 WIPER RING
PT21888017 COMPRESSION RING SET
PT21888018 CYLINDER GASKET
PT21888019 CYLINDER BODY
PT21888020 DOWEL PIN 2.94 X 6.56MM
PT21888021 INPUT REED VALVE
PT21888022 VALVE GASKET
PT21888023 VALVE BODY
PT21888063 AIR PRESSURE GAUGE
PT21888064 FITTING NUT
PT21888065 STEEL EXHAUST PIPE
PT21888066 CHECK VALVE
PT21888067 FITTING NUT
PT21888068 COPPER UNLOADING PIPE
PT21888069 AXLE
PT21888024 OUTPUT REED VALVE
PT21888025 VALVE STOP
PW04M
FLAT WASHER 10MM
PT21888071 WHEEL
PW05M
PS07M
FLAT WASHER 4MM
PW04M
PN02M
FLAT WASHER 10MM
HEX NUT M10-1.5
PHLP HD SCR M4-.7 X 8
PT21888028 HEAD GASKET
PT21888029 CYLINDER HEAD
PT21888074 DRAIN VALVE
PN03M
PW01M
HEX NUT M8-1.25
PW01M
FLAT WASHER 8MM
LOCK WASHER 8MM
FLAT WASHER 8MM
PLW04M
PT21888078 RUBBER FOOT
PT21888032 HEX BOLT M8-1.25 X 155 C8.8
PT21888033 EXHAUST ELBOW VALVE
PT21888034 PLEATED PAPER AIR FILTER
PT21888035 MOTOR COVER
PW01M
PB26M
FLAT WASHER 8MM
HEX BOLT M8-1.25 X 30
PT21888081 TANK 6.34 GALLON
PT21888082 RUBBER GRIP
PT21888036 FLAT WASHER 1/4"
PT21888083 POWER CORD 110V
PT21888084 MOTOR CORD 110V
PT21888086 RUBBER SEAL
PS01
PHLP HD SCR #10-24 X 1/2"
EXT RETAINING RING 14MM
PR02M
PT21888039 FAN
PT21888087 COPPER SEAL
PT21888040 HEX BOLT M5-.8 X 95
PT21888088 MACHINE DATA LABEL
PT21888089 AIR DRAIN LABEL
PLW01M
LOCK WASHER 5MM
-23-
model t21888 (mfg. since 2/10)
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Warranty
Warranty
grizzly industrial, inc. warrants every product it sells for a period of 1 year to the original
purchaser from the date of purchase. this warranty does not apply to defects due directly or
indirectly to misuse, abuse, negligence, accidents, repairs or alterations or lack of mainte-
nance. this is grizzly’s sole written warranty and any and all warranties that may be implied
by law, including any merchantability or fitness, for any particular purpose, are hereby limited
to the duration of this written warranty. We do not warrant or represent that the merchandise
complies with the provisions of any law or acts unless the manufacturer so warrants. in no
event shall grizzly’s liability under this warranty exceed the purchase price paid for the prod-
uct and any legal actions brought against grizzly shall be tried in the state of Washington,
County of Whatcom.
We shall in no event be liable for death, injuries to persons or property or for incidental,
contingent, special, or consequential damages arising from the use of our products.
to take advantage of this warranty, contact us by mail or phone and give us all the details.
We will then issue you a “return Authorization number,” which must be clearly posted on
the outside as well as the inside of the carton. We will not accept any item back without this
number. proof of purchase must accompany the merchandise.
the manufacturers reserve the right to change specifications at any time because they
constantly strive to achieve better quality equipment. We make every effort to ensure that
our products meet high quality and durability standards and we hope you never need to use
this warranty.
please feel free to write or call us if you have any questions about the machine or the
manual.
grizzly industrial, inc.
1203 lycoming mall circle
muncy, pa 17756
phone: (570) 546-9663
fax: (800) 438-5901
e-mail:
techsupport@grizzly.com
Web site: http://www.grizzly.com
thank you again for your business and continued support. We hope to serve you again
soon!
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Warranty card
name_________________________________________________________________
street_________________________________________________________________
City _______________________ state_________________________ zip _________
phone #____________________ Email ________________________ invoice #_____
model # ____________________ order #_______________________ serial #______
The following information is given on a voluntary basis. It will be used for marketing purposes to
help us develop better products and services. All information is strictly confidential.
1. how did you learn about us?
____Advertisement
____Friend
____Catalog
____Card deck
____Website
other:________________________
2. Which of the following magazines do you subscribe to?
____ Cabinet maker
____ Family handyman
____ hand loader
____ handy
____ home shop machinist ____ precision shooter
____ Journal of light Cont. ____ projects in metal
____ popular mechanics
____ popular science
____ popular Woodworking ____ Wooden Boat
____ practical homeowner ____ Woodshop news
____ today’s homeowner
____ Wood
____ Woodsmith
____ Woodwork
____ live steam
____ model Airplane news ____ rifle
____ rC modeler
____ Woodworker West
____ Woodworker’s Journal
____ other:
____ modeltec
____ shop notes
____ shotgun news
____ old house Journal
3. What is your annual household income?
____$20,000-$29,000
____$30,000-$39,000
____$40,000-$49,000
____$70,000+
____$50,000-$59,000
____$60,000-$69,000
4. What is your age group?
____20-29
____30-39
____60-69
____40-49
____70+
____50-59
5. how long have you been a woodworker/metalworker?
____0-2 years ____2-8 years ____8-20 years
____20+ years
6. how many of your machines or tools are grizzly?
____0-2 ____3-5 ____6-9
____10+
____no
____no
7. do you think your machine represents a good value? ____yes
8. Would you recommend grizzly industrial to a friend? ____yes
9. Would you allow us to use your name as a reference for our customers in your area?
note: We never use names more than 3 times. ____yes ____no
10. Comments:_________________________________________________________
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
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send a grizzly catalog to a friend:
name________________________________
street________________________________
city______________state______zip_______
fold along dotted line
place
stamp
here
grizzly industrial, inc.
p.o. box 2069
bellingham, Wa 98227-2069
tape along edges--please do not staple
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