SkyTrak 6036 Service Manual - Manual (Page 233)

8.17 Model 6036 Legacy
Hydraulic System
NOTE:
When checking pressures in
circuits, refer to Section 8.7,
“Hydraulic System Testing” for
correct pressure readings.
Not
OK
If the extend/retract cylinder
does not extend, check
cable connections at main
control valve.
If OK
Repair/replace cable
connections. Ensure extend/
retract section of main control
valve is functioning.
Not
OK
Check main relief pressure at
“VG” port of unloader valve.
Adjust/repair/replace relief
valve on unloader valve.
If OK
Not
OK
If the extend/retract cylinder
drifts or reacts slowly, check
the counterbalance and
pilot-operated check valves
on extend/retract cylinder.
Replace counterbalance and/
or pilot-operated check valves
on extend/retract cylinder.
Not
OK
Check pump flow. Repair/replace pump.
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
Check packing on
extend/retract cylinder.
Repair/replace
extend/retract cylinder.
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.
Not
OK
Check the counterbalance
valve on the
extend/retract cylinder.
Replace
counterbalance valve.
If OK
Not
OK
Check packing on
extend/retract cylinder.
Repair/replace
extend/retract cylinder.
If OK