Murphy Lube Level Maintainer Lm2000s User Manual

LM-00010B  
Revised 10-03  
Catalog Section 15  
(00-02-0422)  
Lube Level Maintainer  
Model LM2000/LM2000S  
Eliminates under/overfill due to “human error”  
See oil level and condition without shutting down  
Simple installation  
Automatically maintains lube level  
Low level switch  
Positive sealing Thumb-Valve  
Heating loop and special mounting capabilities*  
Not intended for use with fuel  
Description  
Specifications  
Optional Hose Kit: 15000355  
Murphy LM2000 model maintains the crankcase Crankcase Balance Vent Connection:  
Quantity Description  
oil level of an engine, pump or compressor.  
Adjusted to the correct running-oil-level, the  
LM2000 will replenish oil as it is used. An inte-  
gral, low-level switch will alarm and/or shutdown  
the equipment if supply oil is lost and the equip-  
ment continues to use oil.  
1/2 NPTF (top).  
1
1
2
2
2
2
1/2 in. (13 mm) I.D. x 3 ft. (914 mm)  
long hose (89020202)  
Inlet Connection: 1/2 NPTF removable screen (side).  
Outlet Connection:  
1 in. (25 mm) I.D. x 3 ft. (914 mm)  
long hose (89020203)  
LM2000 3/4 NPTF (bottom)  
LM2000S 2 x 3/8 NPTF (side)  
1/2 in. (13 mm) worm gear clamp  
(00003502)  
1 x 3/4 NPTF (bottom)  
Thumb-ValveTM Material: Viton.  
Snap-switch: SPDT rating 10 A, 125 VAC; 0.5 A,  
125 VDC; 10 A, 30 VDC.  
1 in. (25 mm) worm gear clamp  
(00003503)  
Application  
The LM2000 maintains oil level on any size  
engine, but is recommended for small to medium  
volume applications and installations that require a  
3-wire, snap-action switch.  
1/2 NPT x 1/2 in. (13 mm) barbed fitting  
(89080801)  
Wire leads: 18 AWG x 24 in.(609 mm) length.  
Conduit Connection: 1/2 inch conduit (female, top).  
Case: Die cast aluminum  
3/4 NPT x 1 in. (25 mm) barbed fitting  
(89081001)  
Lens: Clear “Frog Eye” non-staining, high impact,  
high temperature nylon; UV and heat stabilized.  
Dial: High visibility white background with green and  
white “index” lines for normal level indication.  
Maximum Inlet Pressure: 9.50 psi/25 ft. oil  
(head pressure).  
How the LM2000  
Maintains Levels  
Thumb-Valve Operation  
As the equipment uses oil, the float falls, provi-  
ding immediate level compensation. At FULL  
position, the float holds the valve closed. If the  
clean oil supply is depleted and oil level  
continues to fall, the low level switch will  
operate an alarm or equipment shutdown.  
As crankcase oil level drops, the LM2000 float  
also drops and opens the Thumb-ValveTM. This  
allows oil to flow from the supply tank, through  
the LM2000, and into the crankcase. When proper  
level is attained in the crankcase, the LM2000 float  
rises, causing the Thumb-ValveTM to close off fur-  
ther oil flow.  
Maximum Case Pressure: 15 psi (103 kPa).  
Maximum Differential: 2 in. (51 mm) between  
running and stopped.  
Thumb-ValveTM Operation (Simplified)  
The simple and unique Thumb-ValveTM is non-  
clogging and provides a positive, leak-free seal.  
Maximum Ambient Temperature: 250°F (121°C).  
Float: Brass  
Thumb-Valve™  
FULL  
Oil Inlet  
Flow Rates: SAE 40 motor oil @ 32°F (0°C) with  
2 ft. head pressure: 0.5 GPH (1.9 LPH)  
(1/8” orifice).  
Flow rate through the 1/8 in. (3 mm) orifice is suffi-  
cient to allow crankcase refill through the LM2000.  
Float  
Action  
LM2000  
Case  
NOTE: Friction losses due to piping not considered.  
LOW  
N.C. (red)  
Optional Vent Fitting Kit: 15000954  
Kit sold separately–includes the following items:  
Quantity Description  
COM.  
(white)  
N.O. (black)  
Low Level Switch  
1
1
Tubing vent (15050202).  
1/4 x 1/2 NPT Connector (85030447).  
*
Contact the factory for detailed information.  
See back page for telephone and fax.  
LM-00010B page 1 of 2  

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