968 series Powerig ®
(HK1126)
Alcoa Fastening Systems
12
T
T
ROUBLESHOOTING
ROUBLESHOOTING
NOTE: Use the proper gauges and equipment when troubleshooting. Depending on the pump
version, it is often best to check for leaks by using a hand pump and applying pressure to the
suspect area without the motor running. Watch for leaking oil and follow it back to its source.
Plug the outlet ports of the pump when checking for leakage to determine if the leakage is in
the pump or if it is in the cylinder or tool.
1. Tool fails to operate when trigger is depressed.
a. Loose or faulty air connectors on control hose.
b. Loose or faulty hydraulic hose couplings.
c. Defective tool air trigger assembly.
d. Air trigger sensitivity needs adjusting.
e. Low hydraulic fluid level in reservoir.
f. Hydraulic fluid viscosity too heavy to pick up prime.
g. Clogged suction screen.
h. Defective hydraulic pump.
i. Defective spool valve assembly.
j. Installation tool defective
2. Tool does not return on release of trigger.
a. Defective spool valve.
b. Installation tool not operating properly.
c. Air trigger sensitivity needs adjusting.
d. Hoses not coupled properly.
e. Return pressure set to low.
3. Pump runs but will not build pressure.
a. Low hydraulic fluid level in reservoir.
b. Clogged suction screen.
c. Hydraulic fluid viscosity too heavy to pick up prime.
d. Pump check valve is leaking.
e. Defective air motor.
f. Pull pressure set too low
4. Tool operation slow but entire cycle does occur.
a. Pump check valve is leaking.
b. Hydraulic fluid viscosity too thin.
c. Defective spool valve assembly.
d. Clogged suction screen.
e. Defective air motor.
f. Internal or external relief valve not operating properly.
