256BT Pneudraulic Installation Tool
(HK1109)
Alcoa Fastening Systems
18
Always check out the simplest possible cause of a
malfunction first. For example, an air hose not connected.
Then proceed logically, eliminating each possible cause until
the cause is located. Where possible, substitute known good
parts for suspected bad parts. Use this chart as an aid in
locating and correcting malfunction.
NOTE:
Piston Drift is when the air piston is in the down
position, but the hydraulic pull piston is not in the full
forward position. This causes an out of sequence condition.
1 Tool fails to operate when trigger is depressed.
a) Air line not connected
b) Throttle Valve O‐rings worn or damaged.
c) Throttle valve Cable Assembly is broken.
2 Fastener installation incomplete; No broken pintail.
a) Air pressure too low
b) Air Piston Quad‐Ring worn or damaged.
c) Reservoir empty or low. See Fill and Bleed section.
d) Air in hydraulic system. See Fill and Bleed section.
e) Reservoir Springs worn or damaged
f) Check for piston drift
3 Pintail stripped and/or swaged collar not ejected.
a) Check for broken or worn jaws in nose assembly.
b) Check for loose Retaining Nut
c) Check for piston drift.
4 Tool has piston drift.
a) Loose collet crashing into the front of the anvil,
causing the relief valve to open allowing the piston to
drift. Tighten the collet and see Fill and Bleed section.
b) Worn or damaged Return Pressure Relief Valve
in tool, inspect Seat Assembly, O‐ring, Back‐up Rings,
Steel Ball and Valve Spring. Replace if necessary.
c) Worn or damaged Piston Assembly; Inspect O‐rings
and Back‐up Rings (36). Replace if necessary.
5 Hydraulic fluid exhausts with air or leaks at base of
handle.
a) Worn or damaged Gland Assembly; Inspect Polyseal,
O‐rings and Quad‐Ring. Replace if necessary.
6. Hydraulic fluid leaks at rear of Pull Piston
a) Worn or damaged Rear Gland. Inspect Polyseal and
O‐ring, and replace if necessary.
7. Hydraulic fluid leaks at front of Pull Piston.
a) Worn or damaged Front Gland. Inspect Polyseal, O‐
ring, and Back‐up Ring, and replace if necessary.
8. Pull Piston (18) will not return.
a) Throttle Valve stuck; Lubricate O‐rings.
b) Throttle Arm, Cable Assembly or Trigger binding.
9. Air leaks at air Cylinder Head (60).
a). Worn or damaged O‐ring. Replace if necessary.
T
T
ROUBLESHOOTING
ROUBLESHOOTING
A
A
CCESSORIES
CCESSORIES
Fill and Bleed Bottle
‐
120337
Seat Removal Tool
‐
126136
Fill Tool Assy for reservoir
‐
112465
Stall Nut
‐
120824