• Murphy

LM500 / LM500-TF

The LM500 maintains oil level on any size engine.

As crankcase oil level drops, the LM500 float also drops and opens the Thumb-Valve™. This allows oil to flow from the supply tank through the LM500 and into the crankcase. When proper level is achieved in the crankcase, the LM500 float rises causing the Thumb-Valve to close off further oil flow. If the clean oil supply is depleted and oil level continues to fall, the low-level switch will operate an alarm or equipment shutdown.

Not intended for use with fuel

Specifications Downloads
Specifications Drawer: 

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-Valve™ 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).

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 Case Pressure: 15 psi (103 kPa).

Maximum Differential: 2 in. (51 mm) between running and stopped.

Maximum Ambient Temperature: 250°F (121°C).

Float: 304 Stainless Steel

Flow Rates: Refer to LM500 Series Flow Rates chart for application data.

Dimensions: Overall 6-9/16 inch tall x 6-3/16 inch deep x 3-1/2 deep.
For exact dimensions, refer to document “00-02-0729 LM500 Installation Instructions”.

LM500/LM500-TF Shipping Dimensions: 9.5 (W) x 7.5 (D) x 11 in. (H) (241.3 (W) x 190 (D) x 279.4 mm (H)).

LM500/LM500-TF Shipping Weight: 3 lbs. 13.44 oz (1.74 kg)

Additional product documentation can be found on our product support website or by clicking the Help Center button above.