FW Murphy LM500 Lube Level Maintainer

The FW Murphy LM500 model maintains the crankcase oil level of an engine, pump or compressor. Adjusted to the correct running oil level, the LM500 will replenish oil as it is used. The low level switch will alarm and/or shut down the equipment if the supply oil is lost and the equipment continues to use oil.

Direct Mount (DM) capable

Eliminates under/overfill due to “human error”

See oil level and condition without shutting down

Simple installation

Automatically maintains lube level

Low level, 3-wire, snap-action switch

Positive sealing Thumb-Valve™

Murphy SKU:ex-9428 Category: Tag: Brand:

In stock


Crankcase Balance Vent Connection: 1/2 NPTF (top)
Inlet Connection: 1/2 NPTF removable screen (side)
Outlet Connection: 2 x 3/4 NPTF (side), 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 Wire leads: 18 AWG x 14 in. +/- 2 in. (355 mm) length
Conduit Connection: 1/2 inch conduit (female, top). (Refer to 00-02-0735 Teflon Tape Wrapping Technique)
Case: Die-cast aluminum
Lens: Clear frog eye non-staining, high impact, high temperature polycarbonate; UV and heat stabilized
Dial: High visibility white background with solid green band for normal level indication
Maximum Inlet Pressure: 9.50 psi/25 ft. oil (head pressure)
Maximum Differential: 2 in. (51mm) between running and stopped
Maximum Ambient Temperature: 250o F (121o C)
Float: 304 Stainless Steel

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Possible replacements and related products