Murphy LM500 User Manual

Section 15 00-02-0729
02-11-11 - 8 -
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.

Murphy LM500 Specifications

Connections

Crankcase balance vent connection	1/2 NPTF (top)
Inlet connection	2 x 3/4 NPTF (side)
Conduit connection	1/2 inch conduit (female, top)

Switch Specifications

Snap-switch SPDT rating (AC)	10 A, 125 VAC
Snap-switch SPDT rating (DC)	0.5 A, 125 VDC, 10 A, 30 VDC

Pressure and Temperature

Maximum inlet pressure	9.50 psi/25 ft. oil (head pressure)
Maximum differential pressure	2 in (51mm) between running and stopped
Maximum ambient temperature	250°F (121°C)

Physical Characteristics

Wire leads length	14 in +/- 2 in (355 mm)
Case material	Die cast aluminum
Lens material	Clear “Frog Eye” non-staining, high impact, high temperature nylon