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FW Murphy LM500 Series Installation Manual

FW Murphy LM500 Series Installation Manual

Lube level maintainer

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Installation of Lube Level Maintainer
Models LM500 / LM500-TF
Please read the following instructions and warnings before installation. Visually inspect the product for any damage that
may have occurred during shipping.
Before installation of this product:
It is your responsibility to ensure that qualified mechanical and
electrical technicians install this product.
Disconnect all electrical power to the machine.
WARNINGS
Make sure the machine cannot operate during installation.
Follow all safety warnings of the machine manufacturer.
Read and follow all installation instructions.
Please contact FW Murphy Production Controls immediately if
you have any questions.
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. The
LM500-TF model includes a test feature that confirms both the float and switch are
operating correctly with a single press of the test button.
Range of the Snap-Switch
This illustration shows the LM500 dial and the operating range of the switch. If level is within the designated zones, the switch
will activate.
The switch activates approximately 1/4 in. (6 mm) from the bottom of the low zone. If the level continues to drop into the low-
low zone, a shutdown will occur.
Test Feature
The form C (3-wire) contact allows a
controller/annunciator to be wired as a
closed loop system, resulting in a reliable
fault-sensitive circuit.
NOTE: Holding test button for a prolonged
period of time could cause crank case to
overfill.
LM500 Series Flow Rates
LM500 Series Flow Rates
4.000
3.500
3.000
2.500
2.000
1.500
1.000
0.500
0.000
0
10
20
30
40
1
sect. 15
NOTE: Color zones on dial
face show approximate normal
operating zones. Actual
conditions may vary depending
upon operating characteristics
of the engine. Placement of
the LM500 according to these
instructions will compensate for
these conditions.
50
60
70
80
90
100
110
Temperature ( ˚F )
00-02-0729
rev. 2022/06/30
The LM500
Series Flow
Rates are
based on SAE
40 motor oil
@2 ft. head
pressure.
Friction
losses due to
piping are not
120
130
considered.

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Summary of Contents for FW Murphy LM500 Series

  • Page 1 Please contact FW Murphy Production Controls immediately if you have any questions. 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.
  • Page 2: Operation

    Operation As the equipment uses oil, the float falls, providing immediate level compensation. At the 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.
  • Page 3 Dimensions, LM500 Series LM500 1/2-14 NPT Electrical Conduit Connection Vent 5-29/32 in. (149 mm) Viewing Lens 1/2-14 NPT 4-1/8 in. Oil Inlet (104 mm) 3/4-14 NPT Outlet (3 places) 4-29/32 in. (124 mm) 6-7/32 in. (157 mm) 3-35/64 in. (89 mm)
  • Page 4: Typical Installation

    The Universal bracket uses 4 screws with a lock washer and flat washer on each. Follow instructions for Pipe Bracket Kit (15000518) or Universal Flange kit (15000519). See LM500 Series Kits. CAUTION Excessive vibration can cause overfill. Be sure mounting brackets are supported.
  • Page 5 Universal Flange Mount (UB) (P/N 15000519) The Universal Flange bracket has two mounting methods: base mounting or oil pan mounting. Base Mounting 1. Install the universal bracket to the base as shown using a 5/16 inch diameter bolt and lock washer, customer supplied.
  • Page 6 Connect Fittings and Hoses The following instructions start after LM500 is mounted, using Hose Kit (15000355) and Fitting Kit (15000943). If connecting to the drain plug on the crankcase, we recommend adding a T-fitting to allow draining of IMPORTANT the oil for service. IMPORTANT Apply a sealant such as Teflon®...
  • Page 7 Connect LM500 to Oil Supply Tank Perform the Operation Test after the unit is installed and wired appropriately. 1. Remove the plug from the oil inlet connection. Be sure the removable screen inside the connection is clear of debris. Install the oil inlet connection. 2.
  • Page 8: Specifications

    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) 2022 FW MURPHY. A copy of our typical warranty may be viewed or printed by going to www.fwmurphy.com/warranty.

This manual is also suitable for:

Lm500-tf series