HTL W-4 - Troubleshooting; Gauge, Cylinder, and Pump Issues

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Troubleshooting
Symptom Probable Cause Action Required
Gauge shows
pressure
build-up but
the tool will
not cycle.
1. Couplings loose or
inoperative.
2. Solenoid inoperative.
1. Tighten and/or replace couplings.
2. If solenoid is bad, replace.
Cylinder will
not retract.
1. Voltage to electric
pump is too low to line
drop or inadequate
amperage is available.
2. Linkage between
piston rod and drive
arms are broken.
1. Get shorter extension cord. If shop power is adequate, draw power
from welding machine or cal rod transformer.
2. Replace part as necessary
Wrench
pressure will
not build.
1. Oil blow by in wrench
(Piston seal leak,
blown O-ring, cracked
piston).
2. Pump problem.
1. Replace defective parts. Return to HTL.
2. Check to see if sub plate is worn. Remove screws from pump motor
to reservoir, slide pump motor to the side, turn pump on and while
holding down on the button, put your nger on the dump tube (round
tube under the directional control valve) if you feel pressure, then
replace the subplate and shear seals.
3. Check to see if you have leaks from the external relief valve and the 2
oil line connections (bottom of relief valve and connection into pump
body’s other end) of oil line. If leaking, retighten with 9/16” open end
wrench. Return to HTL.
4. If pump sounds like there is rattling in the air motor, take pump to
your local HTL oce or Distributor.
5. Air Pumps - Faulty air valve due to excessive moisture and/or dirt
in air supply. Disassemble air valve and wipe any residue from air
valve piston. Spray brake cleaner into air valve body, dry thoroughly.
Disassemble all small air lines and blow out with compressed air.
Lubricate both air valve piston and body with hydraulic oil (sparingly)
and reassemble. Return to HTL.
6. Air pumps - Faulty.
HTL-Operating-Instructions-DS.indd 19 11/04/2017 10:15