21
2013 & 2014 series Pneudraulic Installation Tools
(HK978)
Troubleshooting
Always check the simplest possible cause (such as a loose or disconnected trigger line) of a malfunction first. Then
proceed logically, eliminating other possible causes until the cause is discovered. Where possible, substitute known
good parts for suspected defective parts. Use this Troubleshooting information to aid in locating and correcting
trouble.
1. Tool fails to operate when trigger is pressed.
a.
Air-line not connected or air pressure too low.
b. Worn or damaged throttle valve O-rings.
c Broken throttle valve cable
.
2. Tool does not complete fastener installation and
break pintail.
a.
Air pressure too low
.
b.
Worn or damaged air piston Quad-ring
.
c. Tool is low on hydraulic fluid
. See the
Fill and
Bleed
section.
d. Air in hydraulic system. See the
Fill and Bleed
section.
e.
Collet backed off from Piston
.
3. Pintail stripped and/or swaged collar not ejected.
a. Check for broken or worn jaws in nose
assembly. See Nose Assembly Data Sheet.
b. Check for loose retaining nut.
c. Check for piston drift.
4.
Hydraulic fluid exhausts with air or leaks at base
of handle.
a. Worn or damaged gland assembly (P/N
116134-1
). Inspect Polyseal and all rings
.
R
eplace if necessary.
5. Tool has piston drift.
a.
Loose collet crashing into the front of the anvil
causing the relief valve to open. Tighten the
collet. See the
Fill and Bleed
section.
b. Worn or damaged return pressure relief valve.
Inspect seat, O-ring, Back-up rings, ball, and
valve spring. Replace if necessary.
c. Worn or damaged Piston Assembly. Inspect
O-rings and Back-up rings. Replace if necessary.
6.
Hydraulic fluid leaks at rear of pull piston.
a.
Worn or damaged rear gland. Inspect O-rings
and Back-up rings
. R
eplace if necessary.
7.
Hydraulic fluid leaks at front of pull piston.
a.
Worn or damaged front gland. Inspect Polyseal,
wiper, and O-ring. Replace if necessary
.
8. Pull piston will not return.
a. Throttle valve stuck; lubricate O-rings.
b. Throttle arm, cable, or trigger binding.
c.
Broken or weak return spring
.
d.
Collet backed off from piston
.
9. Air leaks at air cylinder head.
a. Worn or damaged O-ring. Replace if necessary.
