JLG Skytrak 6036 Service Manual page 186

Trouble
Service Brakes Fail
to Release
Service Brake Failure
Park Lock Brake
Fails to Release
Park Lock Brake
Fails to Set
Power Steering Fail-
ure (Total)
No 4-Wheel or Crab
Steering or Failure to
Change Mode
9-73
Probable Cause
Brake pedal not adjusted
correctly
Faulty brake valve
plunger, piston, or spring
Ruptured hydraulic hose
Faulty brake valve spring,
plunger, piston or valve
Pressure reducing valve
failure
Insufficient pressure at
sequence valve
Defective discs or leakage
within brake
Ruptured hydraulic hose
Defective park lock switch
Park lock release valve
fails to shift
Defective park lock
Corrosion, binding or worn
parts in park lock
Defective solenoid
Defective switch
Ruptured hydraulic hose
Faulty power steering unit
Tandem pump failure
Defective solenoid in steer
select valve
Faulty steer select switch
or wiring
Broken spring in steer se-
lect valve
Remedy
Adjust pedal linkage (para 4.3.1).
Repair brake valve as required (para 9.3.2).
Replace hose. Bleed brake lines (para 9.3.2g).
Repair brake valve as required (para 9.3.2).
Install pressure reducing valve cartridge (para
9.3.7).
Adjust or replace cartridge (para 9.3.5) .
Repair service brakes using repair kits as re-
quired (para 5.2.2).
Replace hose.
Replace park lock switch (para 10.7.4).
Replace solenoid or valve (para 9.3.3).
Install seal kit or other kits in park lock as re-
quired (para 5.2.6).
Install repair kits in park lock as required (para
5.2.6).
Replace solenoid (para 9.3.3).
Replace switch (para 10.7.4).
Replace hose.
Repair or replace power steering unit.
Repair tandem pump (para 9.4.1).
Repair steer select valve (para 9.3.4).
Replace switch or repair wiring as required (para
10.7.7).
Repair steer select valve (para 9.3.4).
Model 6036 S/N 9B0499 and Before
Section 9. Hydraulic System