Lull 944E-42, Service Manual

Page: 597 / 844

9.89 Model 644E-42/944E-42 Rev. 6/04
Electrical System
Auxiliary hydraulic
pressure release switch
does not release pressure
from system.
Replace fuse.
Check auxiliary hydraulic
(F10) 5 amp fuse.
Not
OK
If OK
If
OK
Not
OK
With switch in the ON
position, verify that solenoids
are magnetized by holding a
metal object next to the
solenoid. Or, test resistance
in solenoid. Refer to
page 9.229
Replace failed solenoid.
If OK
Not
OK
At switch connector, at pin
2, wire [AH3B] (RED/WHT),
check for battery voltage.
Repair/replace open cab
harness.
If OK
Not
OK
At switch connector, at pin
3, wire [AH4] (RED), check
for battery voltage.
Repair/replace auxiliary
hydraulic pressure
release switch.
Before troubleshooting any
electrical circuit, ALWAYS
begin by checking the
following:
1. All connections relating to
circuit are clean and tight.
2. All grounding straps are
intact and securely
fastened, refer to Section
9.1.12, “General Overview
(Vehicle Ground Strap
Locations).”
Continued from 9.87
Problem is hydraulic.
Refer to Section 8,
“Hydraulic System,”
pages 8.126, 8.128,
8.134 or 8.136.