7.
HYDRAULIC
SYSTEM
P.
Trouble
1.
Implement cannot
be
lifted, or
lift
speed is slow.
!
Probable cause
1.
Hydraulic pump drive shaft damaged.
2.
lnsufficient hydraulic pump discharge.
3.
Hydraulic fluid (Use transmission
oil) has excessive viscosity.
lnsufficient hydraulic fluid.
4.
Filter clogged.
5.
Spool not functioning correctly.
6.
Faulty stop valve
"0
ring.
7.
Relief valve (safety valve) worn or
damaged.
Improper pressure setting.
Din
in relief valve seat.
Remedy
Replace drive shaft.
Clean
or
replace.
Change hydraulic oil.
Add transmission oil.
Clean.
Replace completely.
Replace.
Replace spring.
Adjust setting.
Clean.
I
(
not drop.
(
pool
return spring damaged.
1
Replace spring.
I
Push rod does not function Clean or replace.
smoothly.
I
I
1
2.
Stop valve seat seized.
/
Replace.
3.
Rate of free descent
Je
3.
Hydraulic cylinder piston seized.
1.
Spool worn.
lnsufficient free travel when spool
is at a neutral position.
2.
Faulty valve seats.
Din in valve.
Faulty
"0
ring.
3.
Stop valve
"0
ring defective.
Faulty seats.
4.
Hydraulic cylinder piston or cylinder
damaged or worn.
Broken
"0
ring.
5.
Safety valve seat seat faulty.
Din in valve.
Broken
"0
ring.
Faulty control valve or hydraulic
Replace.
Clean or replace.
Replace
Replace.
Replace.
I
I
/
Pump improperly fined.
I
cylinder
"0"
rings;
1
3.
Control valve
lift
position
(
Adjust stroke by control lever turnbuckle.
1.
Pump gear faulty.
1
Replace.
4.
2.
Air being drawn in (cavitation)
because of insufficient oil.
Excessively high oil viscosity.
A
I
regulation is excessive.
Strange noises.
Bleed air or change oil.
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