SkyTrak 6036 Service Manual - Manual (Page 184)

Section 9. Hydraulic System
9-71 Model 6036 S/N 9B0499 and Before
Trouble Probable Cause Remedy
9.5 TROUBLESHOOTING
Cannot Lower
Elevated load
Cavitation and Noise
Ruptured Hose
Hose Cover Sepa-
rated from Wire
Damaged Threads on
Fittings
Boom Hoist or Ex-
tend Function Slow
or Malfunctioning
Ruptured hoist or extend
hose
Loss of engine power or
hydraulic pump failure
Faulty main control valve
Fluid level in reservoir is
low
Filler/breather is clogged
Air leaks in suction line
Loose tandem pump
mounting hardware
Loose pump sections
Defective tandem pump
Damaged hose due to
tight bend
Pressure setting for main
relief valve is too high
Hose is twisted
Connections are too tight
or cross threaded
External fluid leakage at
tubes, hoses or fittings
Faulty relief valve setting
Internal leakage in cylin-
ders
Internal leakage in control
valve
Defective tandem pump
Lower load using Emergency Boom Lowering
instructions in Owners/Operators Manual.
Lower load using Emergency Boom Lowering
instructions in Owners/Operators Manual.
Repair main control valve (para 9.3.1).
Add fluid. Refer to Owners/Operators Manual.
Clean or replace filler/breather.
Using an oil can containing system fluid, squirt
a little fluid on each joint of the suction line and
tighten any joint where fluid stopped the noise.
Double clamp if necessary.
Tighten mounting capscrews to 75 lb-ft (101,7
N m).
Tighten hardware to 200 lb-ft (271,2 N m). Refer
to para 9.4.1.
Repair pump (para 9.4.1).
Replace hose and install without tight bends or
twists.
Check and set the main relief valve (para 9.1.1).
Replace and make sure the hose does not turn
as swivel fitting is tightened.
Repair hose fittings if possible or replace hose.
Check and tighten connections at valves,
pumps and cylinders. Repair or replace faulty
hose(s).
Set relief valves (para 9.1.1 and 9.1.2).
Repair cylinders as required (para 9.2.1 and
9.2.2).
Repair control valve as required (para 9.3.1).
Repair tandem pump (para 9.4.1).