Lull 944E-42 Service Manual - Manual (Page 666)

Electrical System
9.156 Model 644E-42/944E-42 Rev. 6/04
9.10.8 Hydraulic Oil Filter Restriction Warning Indicator Troubleshooting
0000000
RPM X 100
5
10
15
30
20
25
F
1/2
E 104
176
80
248
120 °C
°F
r/min
D
MU4420
Check for plugged
hydraulic oil filter.
Hydraulic oil filter
restriction warning
indicator stays ON
while operating.
Replace filter
Disconnect harness at
hydraulic oil filter pressure
switch. Indicator light
should go out.
If OK
Replace air filter pressure
switch and retest system.
If OK
Check circuit for ground on
wires [D10] (YEL/PUR) or
[D10A] (YEL/PUR).
If grounded, repair wire.
Refer to page 9.48 or 9.50.
Replace front dash panel.
If circuit tests OK
Hydraulic Oil Filter
Restriction
Warning Indicator
Not
OK
Not
OK
Before troubleshooting any
electrical circuit, ALWAYS begin
by checking the following:
1. Fuses.
2. Battery for proper charge.
3. All connections relating to
circuit are clean and tight.
4. All grounding straps are intact
and securely fastened, refer to
Section 9.1.12, “General
Overview (Vehicle Ground
Strap Locations).”
5. Check dash panel bulbs for
proper function.