Murphy LM500 User manual

00-02-0729
02-11-11
Section 15
Lube Level Maintainer
Models LM500/LM500-TF
Installation Instructions
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Please read the following information before installing.
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT:
•A visual inspection of this product for damage during shipping is
recommended before installation.
•It is your responsibility to ensure that qualified mechanical and electrical
technicians install this product.
•Disconnect all electrical power to the machine.
•Make sure machine cannot operate during installation.
•Follow all safety warnings of the machine manufacturer.
•Read and follow all installation instructions.
•Please contact FW MURPHY immediately if you have any questions.

Table of Contents
General Information.........................................................................................................................1
Description...........................................................................................................................1
Dimensions ..........................................................................................................................1
Operating the Range of the Snap Switch.............................................................................2
Test Feature.........................................................................................................................2
Thumb-ValveTM Operation....................................................................................................3
LM500 Series Flow Rates....................................................................................................3
Service Parts (Specify part number) ....................................................................................3
Hose Kit: (P/N 15000355) ....................................................................................................4
Vent Fittings Kit: (P/N 15000954).........................................................................................4
Fittings Kit: (P/N 15000943).................................................................................................4
Typical Installation...........................................................................................................................5
Mounting the LM500 ............................................................................................................5
Pipe Bracket Mounting (PM) (P/N 15000518)......................................................................5
Universal Bracket Mounting (UB) (P/N 15000519)...............................................................5
Base Mounting.................................................................................................................5
Crankcase (Oil Pan) Mounting.........................................................................................6
Connecting Fittings and Hoses ............................................................................................7
Connecting the LM500 to an Oil Supply Tank......................................................................8
LM500 Typical Installation Shown........................................................................................8
Specifications...................................................................................................................................9

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Section 15 00-02-0729
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General Information
Description
The 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 shutdown 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.
Dimensions
Pipe Mount Universal Mount

Section 15 00-02-0729
02-11-11 - 2-
Operating the Range of the Snap Switch
Figure 1 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. The dial-in
Figure 1 shows that if the level continues to drop into the low-low zone, a shutdown will occur.
Figure 1
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 the
above instructions will compensate for these conditions.
Test Feature
The form C (3-wire) contact allows a controller/enunciator to be wired as a closed loop
system, resulting in a reliable fault-sensitive circuit.
NOTE: Holding test button in for a prolonged period of time could cause
crank case to over fill.

Section 15 00-02-0729
02-11-11 - 3-
Thumb-ValveTM Operation
As the equipment uses oil, the float falls, providing immediate level compensation. At
FULL position, the float holds the valve closed. If the clean oil supply is depleted and oil
level contuse to fall, the low level switch will operate an alarm or equipment shutdown.
LM500 Series Flow Rates
LM500 Series Flow Rates are based on SAE 40 motor oil @2 ft. head pressure. Friction losses
due to piping are not considered.
Service Parts (Specify part number)
Description Part Number
Vent Fittings Kit 15000954
Hose Kit 15000355
1/2 NPT x1/2in Hose Barbed Fitting 89080801
3/4NPT x 1/2in Hose Barbed Fitting 89081001
Pipe Bracket Kit 15000518
Universal Flange Kit 15000519

Section 15 00-02-0729
02-11-11 - 4-
Hose Kit: (P/N 15000355)
Quantity Description
1 1/2in (13mm) I.D. x 3ft. (914mm) long hose.
1 1in (25mm) I.D.x 3ft (914mm) long hose.
2 1/2in (13mm) worm gear clamp
2 1in. (25mm) worm gear clamp
2 1/2NPT x 1/2in. (13mm) barbed fitting
Vent Fittings Kit: (P/N 15000954)
Quantity Description
1 Tubing vent
1 1/4 x 1/4NPT connector
Fittings Kit: (P/N 15000943)
Quantity Description
1 Tubing vent
1 Hose barb, 1/2NPT to ½ Hose.
1 Hose Barb, 1in. I.D. HOSEX 3/4NPT
1 Connector, 1/4T x 1/2

Section 15 00-02-0729
02-11-11 - 5-
Typical Installation
Mounting the LM500
NOTE: Mount the LM500 as close as possible to the crankcase.
CAUTION: Excessive vibration can cause overfill. Be sure mounting brackets are
supported.
The following instructions are based on the use of the pipe and universal mounting brackets shown on page 1.
Pipe Bracket Mounting (PM) (P/N 15000518)
1. Mount a nominal 1/2in. (13mm) diameter pipe to the base of the engine.
2. Install the pipe bracket to the lM500 using two 1/4-20 UNC x 1 inch bolts; nuts and lock
washers supplied. See Figure 2A.
3. Slip the LM500 onto the pipe and install the two adjustment bolts. Each bolt consists of
a 1/4-20 UNC x 1in. bolt, nuts and lock washers. See Figure 2B. DO NOT tighten the
adjustment screws too tight as height adjustment might be needed later during the
operation. Refer to “Connecting Fittings and Hoses”, for more information regarding
height adjustment of the LM500 in alignment with the oil level in the crankcase.
Figure 2A Figure 2B
Universal Bracket Mounting (UB) (P/N 15000519)
The universal bracket has two mounting methods: base mounting or pan mounting.
Base Mounting
1. Install the universal bracket to the base as shown in Figure 3A using two split lock
washers and two 5/16 inch dia. Bolts or others a necessary.

Section 15 00-02-0729
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2. Mount the LM500 to the universal bracket using two 1/4-20 UNC x 1-1/4 inch (32mm)
bolts; flat and lock washers supplied (Figure 3B). DO NOT tighten the adjustment
screws too tight as you will have to adjust the LM500 later in the installation process.
Refer to “Connecting Fittings and Hoses” for information regarding height adjustment of
the LM500 in alignment with the oil level in the crankcase.
Figure 3A Figure 3B
Crankcase (Oil Pan) Mounting
1. Install the universal bracket to the crankcase using the existing crankcase bolts (Figure
4A). Crankcase bolt diameter must be no larger than 7/16 inch (11mm).
Figure 4A Figure 4B
NOTE: Check clearance between crankcase and mounting bracket before
installing the mounting bracket. If space between the crankcase and
mounting bracket is narrow, attach LM500 to mounting bracket prior to
installation on crankcase.

Section 15 00-02-0729
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2. Mount the LM500 to the universal bracket using two 1/4-20 UNC x 1-1/4 inch bolts, flat
and lock washers supplied. DO NOT tighten the adjustment bolts to tight as height
adjustment might be needed later during the operation. Refer to “Connecting Fittings
and Hoses” for information regarding height adjustment of the LM500 in alignment with
the oil level in the crankcase.
Connecting Fittings and Hoses
The following instructions are based on the Murphy hose kit
described on page 3.
1. Install the LM500 fittings in their proper locations
NOTE: Apply a sealant such as Teflon®, to all
threaded connections.
2. Attach the 1 inch (25mm) diameter, flexible monitoring hose
to the crankcase and the monitoring port on the LM500. See
Figure 5.
CAUTION: The hose must slope slightly downward from
the LM500 and MUST NOT have any droops or low spots.
NOTE: if the drain plug on the crankcase is used for the connection, it is
recommended that a tee be installed to allow draining of the crankcase for
service.
3. Install the 1/2 inch (13mm) I.D. x 3 ft (914 mm) hose to the vent connection on the
LM500 and to vent connection on the crankcase. See Figure 5. The vent connection
on the crankcase must be well above the regulated oil level. All hoses must be
clear of obstructions, valleys, or dips that could create liquid traps, or gas/air pockets.
The vent and crankcase connections should be as straight as possible.
BEFORE CONTINUING, VERIFY THAT ALL HOSE CLAMPS ARE TIGHT.
4. Fill the crankcase to the proper oil level.
IMPORTANT: With the engine running and warm, loosen the mounting
bracket adjustment bolts and adjust the LM500 so that the oil level in the
sight gauge is aligned with the middle of the green bar on the dial (see
example, Figure 5).
5. Tighten the adjustment bolts securely.

Section 15 00-02-0729
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Connecting the LM500 to an Oil Supply Tank
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. Connect a 1/2inch I.D. (13mm) or larger hose to the oil inlet fitting on the LM500 and to
the shutoff valve on the oil supply tank. See Figure 6. Recommended minimum height
above the LM500 is 2 ft. (0.6); maximum 25ft (7.7mm). The hose must maintain a
downward slope and not have low spots or droops. Maximum head pressure rating is
9.50psi or 25ft. oil (head pressure).
3. Before filling the supply tank with oil, be sure the tank is clean and dry and the shutoff
valve is closed. Also, be sure all hoses and clamps are tight. Fill the tank with CLEAN
oil.
WARNING: Overfill condition can be caused by excessive
inlet pressure and/or improper “vent-to-crankcase”
installation.
4. After oil supply tank is full, open the shutoff valve.
Next, make the proper electrical connections for the application. (See snap switch
ratings on page 8 and schematic on page 2.)
LM500 Typical Installation Shown
WARNING: Perform this installation using
appropriate protection. Trapped air and hot
oil may cause burns.

9270-20-0051noitceS
-11-11-20 9-
Specifications
Crankcase Balance Vent Connection: 1/2 NPTF (top).
Inlet 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 AWGT 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 nylon; 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: 250oF (121oC)
Float: 304 Stainless Steel
Flow Rates: Refer to Flow Rate Chart on page 3.
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