314 ARR1575
18 Troubleshooting
Checking the control piston movement e.g. by means of
ascrewdriver.
Press the piston to the stop from the left to the right three to
four times.
The movement must not be sti in any case!
It must move smoothly and return easily to the zero posi-
tion under the force of the spring, from both sides.
If the control piston does not move smoothly after sev-
eral movements, or it does not spontaneously return to
the zero position, it is mechanically damaged.
The servo block must be repaired in a professional
workshop.
A view of the pump before assembly.
Check the magnetic valve seals for damage.
Lubricate them slightly with oil.
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