LM-00010B
Revised 10-03
Catalog Section 15
(00-02-0422)
Lube Level Maintainer
Model LM2000/LM2000S
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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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