Fatigue Technology Inc.
401 Andover Park East
Seattle, WA • USA 98188-7605
Tel: (206)246-2010
Fax: (206)244-9886
10
49050-REV M
PROBLEM
CAUSE
SOLUTION
5.2 MANDREL WILL NOT PULL BACK INTO THE BARREL OF THE PULLER UNIT
(a) Inadequate air pressure or
flow.
(a) Obtain air pressure at 90 to 120 psi and flow at
20 cfm with a hose diameter of 3/8-inch
minimum inside diameter.
(b) Trigger response valve is not
properly adjusted.
(b) While squeezing the trigger of puller unit, loosen
the brass nut on the trigger response valve.
Adjust the valve pilot in or out until the desired
sensitivity is obtained. Retighten the brass nut.
(c) Loose oil coupling to the
puller unit.
(c) Check the quick-disconnect couplings on the
hose and pump. Inspect couplers to ensure that
they are completely tightened.
(d) Oil level too low.
(d) Refer to Section 4.2, Checking Hydraulic Fluid
Level.
(e) Hydraulic line from the puller
unit is not attached to the
hydraulic quick-coupler.
(e) Connect the hydraulic line to the hydraulic quick-
coupler.
(f) Vacuum in reservoir.
(f) Check for a plugged vent in the vented filler cap
and dipstick. Loosen the filler cap 1 to 2 turns.
(g) Flow check valve in coupler
does not stay open when
coupler is connected properly.
(g) Replace the coupler.
(h) Dirt in pump or filter plugged. (h) The oil pick-up strainer should be cleaned; if
necessary, the PowerPak should be dismantled
and all parts inspected and cleaned. Replace the
hydraulic oil.
(i) Leak in the air circuit.
(i) Ensure there are no air leaks from any fittings.
Tighten fittings to eliminate the leaks. NOTE:
Leaks from the puller unit trigger are acceptable.
(j) Relief valve or low pressure
unloading valve is out of
adjustment.
(j) Readjust as needed. Because this adjustment is
complex, contact FTI about procedures for return
or repair.
