4-3
HYDRAULIC SYSTEM PRESSURE
REQUIREMENTS
A tractor hydraulic system pressure setting of 1875
psi (1846 QT) or 2000 psi (2246 QT) is recommend-
ed for maximum efficiency and service. The Bush
Hog control valve is pre-set at factory and should not
be adjusted.
4-4 TROUBLESHOOTING
Troubleshooting procedures are listed in table 4-1. If
the problem cannot be solved or replacement parts
are necessary, contact your authorized Bush Hog
dealer. Please have ready your machine name,
model number, serial number, purchase date, and
exact cause or description of problem.
TABLE 4-1
PROBLEM
POSSIBLE CAUSE
REMEDY
1. Loader slow and/or will not
Hydraulic oil too heavy.
Change to proper oil.
dump.
Oil filter plugged.
Clean or replace filter.
Hydraulic pump worn.
Repair or replace pump.
Oil line restricted or leaking.
Check all hoses and tubes for
leaks, damage or restrictions.
Replace damaged or restricted
hoses or tube lines.
Quick couplers not properly connected.
Check connection - Replace if necessary.
Control valve does not shift properly.
Inspect, clean, repair or replace valve.
Air in hydraulic system.
Cycle lift cylinders and bucket cylinders
several times to free system of air.
Cylinder leaks internally.
Replace seals.
Faulty valve.
Replace or repair valve.
2. Loader chatters or vibrates
Air leak in pump inlet line.
Check, tighten or replace inlet. line
.
when raising or lowering
.
Air in hydraulic system.
Cycle lift an
d bucket cylinders.
Oil level too low.
Add oil as required.
3. Pump noisy.
Inlet line restricted or leaking.
Check for air leaks restrictions or
collapsed hose. Tighten or replace
hose. Clean filter if necessary.
Oil level too low.
Add oil as required.
Pump worn or damaged.
Repair or replace pump.
4. Oil leaks.
Defective fittings or hoses.
Replace defective parts.
Loose Connections.
Tighten fittings.
Worn or damaged O-ring or
Install a seal repair kit.
wiper seal in cylinder rod end.
Worn or damaged O-rings in valve.
Install an O-ring repair kit.
5. Insufficient lift capacity.
Improper hydraulic pump operation.
Repair or replace pump.
Load is greater than boom lift capacity.
Check loader specifications.
Internal boom cylinder leakage.
Replace any worn parts and install
a seal repair kit.
Improper hydraulic valve operation.
Repair or replace valve.
6. Excessive wear on bucket
Bucket is riding on cutting edge instead
Use boom “FLOAT” position or bucket level
of wear pads.
indicator to ensure bucket rides on wear pads..
7. Slow leakdown.
Worn control valve.
Have authorized Bush Hog dealer replace seals.
Worn cylinder piston seals.
Have authorized Bush Hog dealer replace seals.
8. Hydraulic cylinders inoperative.
Hose from control valve improperly connected.
Refer to plumbing diagrams in Section V.
9. Loader lift and bucket tilt controls do
Hoses improperly connected.
Refer to plumbing diagrams in Section V
and correct hose connections.
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