FW MURPHY LM500 Lube Level Maintainer Instruction Manual

June 4, 2024
FW MURPHY

FW MURPHY LM500 Lube Level Maintainer

The LM500 maintains oil level on any size engine. It also supports installations that require a three-wire, snap-action switch. The form C (three-wire) contact allows a controller/annunciator to be wired as a closed- loop system, resulting in a reliable fault-sensitive circuit. Refer to LM500 Series Flow Rate Chart for application data. The FW Murphy LM500-TF Oil Level Maintainer includes a test feature that confirms both the float and switch are operating correctly with a single press of the test button. The LM500 series maintains the crankcase oil level of an engine, pump or compressor. Adjusted to the correct running oil level, it will replenish oil as it is used. The low-level switch will alarm and/or shut-down the equipment, if supply oil is lost and the equipment continues to use oil. 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. The simple and unique thumb valve is non-clogging and provides a positive, leak-free seal. If the clean oil supply is depleted and oil level continues to fall, the low-level switch will operate an alarm or equipment shutdown.

Specifications

  • Crankcase Balance Vent Connection: 1/2 NPTF (top)
  • Inlet Connection: 1/2 NPTF removable screen (side)
  • Outlet Connection: One connected, two not used (plugged)
    • 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 nor-mal 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
  • Refer to LM500 Series Flow Rates chart for application data Dimensions: Overall 6-9/16 in. (H) x 6-3/16 in. (W) x 3-1/2 in. (D) 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. 7 oz (1.57 kg)

In order to consistently bring you the highest quality, full-featured products, we reserve the right to change our specifications and designs at any time. FW MURPHY product names and the FW MURPHY logo are proprietary trademarks. This document, including textual matter and illustrations, is copyright protected with all rights reserved. (c) 2021 FW MURPHY. A copy of our typical warranty may be viewed or printed by going to www.fwmurphy.com/warranty.

Dimensions: LM500

Dimensions: LM500-TF

Thumb Valve Operation

LM500 Series Flow Rates

Typical Installations

Pipe Mount

Universal Mount

In addition to the direct mounting option, FW Murphy offers two mounting brackets for the LM500.The pipe bracket fits a 7/8 in. (22 mm) diameter pipe. The universal bracket allows various mounting methods. For exact dimensions visit, http://www.fwmurphy.com.

How to Order

Options listed below. All configurations may not be available. Call your sales representative or FW Murphy for more information.

Approximate Shipping Weight and Dimensions

Model| Weight| Dimension
LM500|

3 lbs. 7 oz (1.57 kg)

| 9.5 (W) x 7.5 (D) x 11 in. (H) (241.3 (W) x 190 (D) x 279.4 mm (H))
LM500-TF
Part Number| Description| Notes
---|---|---
15000954| Vent Fittings Kit| One tubing vent, one 1/4 x 1/2 NPT connector

15000355

|

Hose Kit

| One – 1/2 in. (13 mm) I.D. x 3 ft. (914 mm) hose One – 1 in. (25 mm) I.D. x 3 ft. (914 mm) hose Two – 1/2 in. (13 mm) worm gear clamp

Two – 1 in. (25 mm) worm gear clamp

Two – 1/2 NPT x 1/2 in. (13 mm) barbed fitting Two – 3/4 NPT x 1 in. (25 mm) barbed fitting

15000518| Pipe Bracket Kit| Bracket and fasteners
15000519| Universal Flange Kit| Bracket and fasteners
15000532| Bubble Lens Kit| Bubble lens, dial, O-ring and fasteners
15000943| Fittings Kit| One tubing vent; one hose barb, 1/2 NPT to 1/2 Hose; one hose barb, 1” ID hose x 3/4 NPT; one connector, 1/4 x 1/2 NPT

References

Read User Manual Online (PDF format)

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