Engine Oil Pressure Switch - Toro Workman 3000 Series Service Manual

Engine Oil Pressure Switch

The switch is normally closed (NC) and opens with
pressure.
The switch opens at approximately 8 psi.
1. Turn ignition key switch ON. Oil pressure lamp should
be on.
If bulb is not on:
1
1. Disconnect wire from switch and touch wire to a good
ground.
2. If lamp comes on, replace switch.
Figure 26
3. If lamp does not come on check lamp and/or wiring
between lamp and switch for continuity.
1. Engine oil pressure switch
If lamp is on with engine running:
1. Shut off engine immediately.
2. Check switch by disconnecting wire. Light should
go out.
3. If light is still on, check for short circuit in wiring.
4. Install test gauge in engine oil pressure switch port.
Start engine and check for 30 psi minimum at 1500 rpm.
If engine pressure is good, replace switch. If engine
pressure is low, DO NOT operate the engine.
Liquid Cooled Diesel Engine Page 4 - 26 Workman 3300-D/4300-D