Murphy Series LM300 Connecting Fittings and Hoses, Crankcase Oil Pan Mounting

TYPICAL INSTALLATION continued

Crankcase (Oil Pan) Mounting

1.Install the universal bracket to the crankcase using the existing crankcase bolts (Figure 3A). Crankcase bolt diameter must be no larger than 7/16 inch (11 mm).

4.Fill the crankcase to the proper oil levels. With the engine running and warm, loosen the mounting bracket adjustment bolts and adjust the LM300 so that the oil level in the sight gauge is aligned with the white “index line” on the dial (Figure 4). Tighten the adjustment bolts securely.

Crankcase

Bolt

Universal

Bracket

Note Clearance before mounting

Crankcase

Adjustment

Bolt

Connecting the LM300 to an Oil Supply Tank (level maintaining models only)

1.Remove the caplug from the oil inlet connection. Be sure the filter, inside the connection, is clear of debris. Install the oil inlet connection.

2.Connect a 1/2 inch I.D. (13 mm) or larger hose

to oil inlet fitting on the LM300 and to the shutoff		Oil Supply
valve on the oil supply tank. See Figure 5. For		Tank
models LM300 thru LM305 recommended
minimum mounting of the oil supply
tank above the LM is 4 ft. (1.2m);	Oil Inlet
	Hose

Figure 3A Figure 3B

NOTE: Check clearance between crankcase and mounting bracket before installing the mounting bracket. If space between the crankcase and mounting bracket does not allow installation and access to the adjustment bolts advance to Step 3.

2.Mount the LM300 to the universal bracket using two 3/8-16 UNC x 1 inch bolts supplied. DO NOT tighten the adjustment bolts too tight. You will have to adjust the LM300 later in the installation process.

3.If space between the crankcase and mounting bracket is narrow, install the universal mounting bracket to the LM300 before installing to the crankcase oil pan.

Connecting Fittings and Hoses

The following instructions are for all LM300 series level maintainers. All steps that reference oil inlet or oil supply tank DO NOT apply to non-level-maintaining models. Also, these instructions are based on the Murphy optional hose kit described on page 1. If you did not order the optional hose kit, gather the hoses, clamps and fittings as specified in the optional hose kit.

1.Install the LM300 fittings in their proper locations. NOTE: Apply a sealant such as teflon, to all threaded connections.

2.Attach the 1 inch (25 mm) diameter, flexible monitoring hose to the crankcase and the monitoring port on the LM300. See Figure 4. CAUTION: The hose must slope slightly downward from the LM300 and MUST NOT have any droop or low spots.

NOTE: If the drain plug on the crankcase
is used for the connection, we
recommend installation of a tee to	Oil Inlet
allow draining of the crankcase	Vent Hose
for service.	Hose
3. Install the 1/2 inch (13 mm)	Viewing	Running
	Lens
		Engine
I.D. x 3 ft. (914 mm) hose to
		Crankcase
the vent connection on the		Oil Level
LM300 to the vent connection
on the crankcase. See Figure 4.	Monitoring Hose
The vent connection on the
crankcase must be well above the
regulated oil level. All hoses must	Figure 4
be clear of obstructions.

BEFORE CONTINUING, VERIFY THAT ALL HOSE CLAMPS ARE TIGHT.

maximum 15 ft. (4.6m). The

hose must maintain a downward slope and not have low spots or droops. Maximum head pressure rating using standard 1/4 in. (6 mm) orifice is 15 ft. (4.6 meters). See Flow Rate test on

page 1 for additional orifice pressure ratings.

Figure 5

3.Before filling the supply tank with

oil, be sure the tank is clean and dry andthe 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, (maximum inlet pressure depends on orifice), and/or improper “vent to crankcase” installation.

See Flow Rate Test on page 1 for maximum pressure.

4.After oil supply tank is full, open the shutoff valve.

Next, make the proper electrical connections for the application. See contact ratings on page 1 and schematics on page 4.

Switch Test (switch models only) To test the shutdown and/or alarm functions perform the following:

1. Unscrew protective boot from test knob. IMPORTANT: Always replace boot after testing.

2.Turn the test knob 1/4 turn to the right

(clockwise), for low test indication (Figure 6).

3. Turn the knob 1/4 turn to the left Figure 6

(counterclockwise), for high test indication. DO NOT FORCE

THE TEST KNOB TO TURN.

NOTE: After the engine shuts down, you will notice that the oil in the sight gauge glass will rise above normal running level, possibly showing an overfill condition. This is a result of “drain-back” to the engine crankcase and it is normal. Therefore, on models LM302 and LM303 it may be necessary to wire the high level shutdowns into a class “B” or “C” (bypass until first time safe) lockout, so as to allow a permissive start. After the engine is re-started the level will pull down to the normal running level and the shutdown features will be active. A modulating valve (Thumb-Valve™) in the level maintaining models will allow oil usage to be made-up continuously during operation.

LM-92164N page 3 of 4