21
5.6 Troubleshooting
5.
6.1 Drive Unit
Symptom Cause Remedy
Drive unit piston
does not advance or
retract.
Hydraulic coupling is damaged. Replace the coupling.
Hydraulic coupling is
not connected.
Be sure that advance and
retract hoses are connected
at both pump and wrench.
Check that all hose couplings
are fully installed.
Worn or damaged directional
control valve on the hydraulic
pump.
Take pump to authorized
service center. Make repairs
as required.
Drive unit does not
build up pressure.
Piston seal leaks. Replace the seals.
Pump does not build pressure. Adjust the pressure.
Pump is defective. Refer to the pump manual.
Drive unit leaks. Seal failure. Replace the drive unit seals.
Drive unit piston
operates backwards.
Hose connections are reversed. Reconnect the hoses
properly.
Gap between drive
unit housing and
locating plate on
cassette.
Drive unit retaining pin is worn,
damaged or missing.
Replace the drive unit
retaining pin.
5.
6.2 Cassette
Symptom Cause Remedy
Ratchet returns on retract
stroke.
Broken drive shoe. Replace the drive shoe.
Ratchet does not take
successive strokes.
Broken ratchet lever or
ratchet.
Replace ratchet lever and/
or ratchet (as required).
Worn or broken drive shoe. Replace the drive shoe.
Lubricant on the ratchet and/
or drive shoe splines.
Disassemble the cassette
and remove the lubricant
from splines.
ENGLISH
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