| Problem |
Probable
Cause and/or Solution |
| Unit
operates with jerky motion |
 |
Be sure
oil is at the proper level. |
|
Check
for possible leaks and repair if necessary.
|
|
After
any work on the hydraulic system: |
| |
| |
Fill tank
with hydraulic oil. |
| |
Replace filter
cartridge. |
| |
Operate cylinders
to remove air from the system. |
|
|
| Oil
is cold |
|
Use
the following procedure to warm the
oil: |
| |
| |
Start the
engine. |
| |
Engage the
pump. |
| |
Operate
the hoist control to bottom out
the cylinder keeping the lever
pushed for approximately five
(5) minutes to warm up the oil.
|
| |
If
the problem reoccurs, check the
type of oil being used. It is
highly likely that the wrong type
of oil is being used. |
|
|
Air
in the System
(Oil is a milky color) |
|
Check
for a leak in the suction line. |
|
| Unit
does not lift loaded container |
|
Hydraulic
pressure is set too low. Reset the pressure
to 1900 PSI with engine at 1500 RPM.
If pressure cannot reach 1900 PSI, check
pump and replace if necessary. |
|
Hydraulic
cylinder may have an internal leak.
Determine which cylinder is leaking
and repack. |
|
| Control
problems - hesitation noted |
|
Air
is present in the system. Be sure oil
is at the proper level. Look for any
possible air leaks at hose clamps on
the suction hose. |
|
Determine
oil type: use only anti-foam hydraulic
oil. |
|
| Noisy
Pump |
|
Movement is sluggish
or absent. |
|
| Pump
is noisy and faltering when lifting load |
|
Possible damage
to pump: check and replace if necessary.
|
|
| Vibrations,
particularly at high speed |
|
Suction line is
clogged. |
|
| Oil
leaks noticed |
|
If oil is noticed:
|
| |
| |
Change the
seal on the pump shaft. |
| |
Repack the
cylinders. |
| |
Properly tighten
fittings. |
| |
Check hydraulic
oil for foaming. |
|
|
| Reservoir
is overflowing from top |
|
Reservoir is too
full. |
|
Hoist is being lowered
without engaging the pump. |
|
Air is present in
the system. |
|
