| |
Possible
Causes |
|
Remedy |
| 1) |
Piston seal(s) leak. |
1) |
Disassemble and replace
seals. |
| 2) |
Directional control valve
leaks. |
2) |
Refer to "Improper
Directional Control Valve
Operation" troubleshooting
section. |
| 3) |
Single-acting cylinder has
a sufficiently high return
line backpressure. |
3) |
See below: |
| |
| a) |
Restricted
return line. |
| b) |
Dirty
return line filter. |
|
|
| a) |
Remove
restriction. |
| b)
|
Remove
and replace return
line filter. |
|
| 4) |
Common occurrence with closed
center directional valve
in neutral or center position
and pump under load. |
4) |
See below:
| a) |
Charge
to tandem spool-type
valve. |
| b)
|
Unload
the pump. |
| c) |
Change
to valve with special
notch design at valve
spool that prevent
the pressure buildup. |
|
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