SkyTrak 8042 Service Manual - Manual (Page 460)

8.45 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
Not
OK
NOTE:
When checking pressures in
circuits, refer to Section 8.7,
“Hydraulic System Testing,” for
correct pressure readings.
Before troubleshooting any
hydraulic circuit, ALWAYS
begin by checking the
following:
1. Hydraulic oil level in the
reservoir
2. All hoses, tubes, fittings
for leaks, kinks,
interference, etc.
3. Air in the lines
Not
OK
Not
OK
If the outriggers do not go
down, check the left and
right outrigger switches.
Check pump flow.
Not
OK
Check outrigger shuttle valve
on main control valve.
Replace shuttle valve.
If OK
Repair/replace pump.
Refer to Section 9.14.5,
“Outrigger Switches (10042/
10054 Only).”
Check the left and right
outrigger cylinders for
packing leaks.
If OK
Not
OK
Check the solenoid valves on
the outrigger valve.
Refer to Section 9.7.42, “10042
Outrigger Circuit and
Troubleshooting,” and Section
9.7.43, “10054 Outrigger Circuit
and Troubleshooting.”
If OK
Not
OK
Not
OK
Replace solenoid valves.
Replace pilot-operated
check valve(s).
If OK
Check the pilot-operated check
valve in each outrigger cylinder.
Check the spools in the
solenoid valves.
If OK
Repair/replace outrigger
cylinder(s).
If OK
NOTE:
Refer to Section 2.5.4,
“Performance Specifications,”
for
approximate cylinder cycle
times. The operation of the
system function should
approximate the times listed.