Fatigue Technology Inc.
401 Andover Park East
Seattle, WA • USA 98188-7605
Tel: (206)246-2010
Fax: (206)244-9886
57429 – Rev L
13
PROBLEM
CAUSE
SOLUTION
b)
5. Threaded adapter/chuck
assembly will not unthread
from piston assembly.
(a) Torque required to unthread
threaded adapter/chuck
assembly is high enough to
spin the piston assembly.
(a) See disassembly procedures in
Section 4.4-6 (use flats on back of
threaded adapter and mating air
seal adapter).
(b) Inadequate air supply.
600 0
Figure 5.0-8
Pressure Gage (FT-200)
(b) Increase pressure or flow of
available shop air.
- If PowerPak will not generate or
maintain sufficient pressure, the
main air line pressure is too low
or the PowerPak hydraulic
pressure requires adjustment.
- Air pressure requirements:
1/2-inch (12.7mm) ID air line
with 90 to 120 psi (.621 to
.827MPa) for the FT-200.
3/8-inch (9.525mm) ID air line
with 90 to 120 psi (.621 to
.827MPa) for the FT-20.
- Flow requirements:
40-50 cfm (1.13-1.42m
3
/min) for
the FT-200.
20 cfm (.57m
3
/min) for the
FT-20.
6. The mandrel sticks in the hole
when the puller is activated.
(a) Not enough pressure used to
generate pull forces.
(a) Use the following procedure to
analyze the problem:
(1) Actuate the puller and observe
pressure reading on PowerPak
pressure gage (FT-200
PowerPak only, Figure 5.0-8).
(2) Pressure gage should read
6,000 psi (41.37MPa). (Note:
FT-20 PowerPak is factory set
at 10,000 psi (68.95MPa).) If
any increase in pressure is
required, refer to the solution
for Problem 4 in this section
for instructions.
(3) Actuate puller again. If
mandrel remains stuck,
increase pressure to 10,000 psi
(68.95 MPa).
(4) If mandrel remains stuck at
10,000 psi (68.95MPa),
disengage the mandrel from
the puller. Push the mandrel
out. Contact FTI’s Sales
Department for additional
assistance.
