HYDRAULIC RETURN OIL FILTER
SWITCH TEST (See Figure 10G-19)
The hydraulic return oil filter switch is a normally OPEN
(NO) switch. When the hydraulic oil pressure at the
inlet of the filter increases above 20–25 psi the switch
CLOSES and the hydraulic oil filter light comes ON.
FIELD TEST
At the switch, remove both wires from switch and con-
nect together.
• Light comes on, proceed with switch test, Step 1.
• Light does not come on, check circuit wiring and/or
bulb.
Hydraulic oil filter light comes ON when ignition switch
is turned on and stays ON when engine is started.
Remove TAN wire from switch terminal.
• Light goes off, proceed with switch test, Step 1.
• Light does not go off, check circuit wiring for ground.
SWITCH TEST
1. Set multimeter to 200 Ω (ohms) scale.
2. Connect test leads as shown.
•
There should be no continuity and the meter
should read 0–0.5 Ω (ohms).
3. Increase pressure above 20–25 psi.
•
Switch contacts should close.
NOTE
If switch tests okay and the hydraulic return oil
filter light still does not go out, hydraulic filter
should be changed.
Replace a switch that does not meet all the above
test results or has resistance of 0.5 Ω (ohms) or more.
ELECTRICAL SYSTEM
SECTION 10G. SWITCHES
10G-19
10G
Figure 10G-19. Hydraulic Return Oil Filter Switch Test
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