Murphy LM500 User Manual

Section 15 00-02-0729
02-11-11 - 6 -
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.

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