TM 5-3805-262-20
3-25. HYDRAULIC SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. BUCKET DOES NOT RETURN TO DIGGING POSITION (Cont).
Step 3.
Turn ignition key switch to off
p o s i t i o n .
Check orange-white wire between
5 ampere circuit breaker and
control valve assembly for
broken or cracked insulation or
bare wire areas.
a. Repair broken or cracked
insulation or bare wire
areas by applying insulation
t a p e t o a r e a .
b. If wire is okay, go to step
4 below.
Step 4.
Unlock and open front access
door .
Disconnect connector at control
valve assembly bucket spool.
Connect multimeter between pins
A and B of control valve assem-
bly connector.
Multimeter should indicate 55 ohms resistance.
a . I f m u l t i m e t e r i n d i c a t e s z e r o r e s i s t a n c e , n o t i f y n e x t h i g h er
maintenance level to replace control valve assembly (solenoid is
short circuited and must be replaced).
b. If multimeter indicates 55 ohms, repair orange-white wire
tween 5 ampere circuit breaker and control valve assembly
5-168).
Step 5.
Disconnect connector at control valve assembly bucket spool.
Connect multimeter between wiring harness connector pin B and
chassis ground.
Turn ignition key switch to on position.
Multimeter should indicate 24 volts.
Turn ignition key switch to off position.
b e-
(page
a. If 24 volts not obtained, check orange-white wire between wiring
harness connector and 5 ampere circuit breaker for continuity.
I f c o n t i n u i t y o b t a i n e d, remove right instrument panel (page
5-48) and replace circuit breaker (page 5-53).
b. If 24 volts obtained, go to step 6 below.
3-183
