Operating Instructions Form No. 1000090
PROBLEM
CAUSE
SOLUTION
Sheet No.
6 of 6
Rev 3
Date: 25 May 2012
Wrench will not retract.
1.
Check the system pressure; if
the pressure is zero, the control
valve is releasing pressure and
the problem may be in the
wrench, mechanical linkage
connected to wrench(s), or
quick-disconnect couplings.
2.
Defective valve.
3.
Inadequate air pressure (air
motor model only).
1.
Check the wrench for broken
return springs, and check
couplers to ensure that they are
completely coupled.
Occasionally couplers have to
be replaced because one check
does not stay open in the
coupled position.
2.
Check valve operation and
inspect parts. Replace if
necessary.
3.
Increase air pressure.
Pump delivers excess oil
pressure.
1.
Faulty pressure gauge.
2.
Relief valve not properly set.
1.
Calibrate gauge.
2.
Adjust the relief valve.
Pump will not build full pressure.
(Continued)
7.
Sheared key(s).
8.
Inadequate air pressure (air
motor only).
9.
Shifting spool seat and/or
shifting spool poppet (located
under high pressure pump
assembly) worn.
10. Shifting spool o-ring (located
within shifting spool bore) worn
or broken.
7.
Replace.
8.
Increase air pressure.
9.
Clean and reseat or replace.
10. With an o-ring pick, remove
o-ring and backup washer
through low pressure pump
assembly end. Replace.
