Fatigue Technology Inc. 401 Andover Park East Seattle, WA • USA 98188-2868 Tel: (206)246-2010 Fax: (206)244-9886
14 358856-REV K
5.2 PULLER RETRACTS ON TRIGGER ACTUATION, BUT WILL NOT RETURN TO START POSITION
PROBLEM CAUSE SOLUTION
ON TRIGGER
ACTUATION, BUT
WILL NOT RETURN
TO START POSITION
hydraulic oil to lubricate the
piston and cylinder.
Disconnect the hydraulic line and install the CT-604
Pressure Relief Tool onto the end of the hose.
Disconnect the air signal line (see Figure 3.1-1) but
leave the air pressure line connected. Leave the pump
connected to the air supply. Remove the back end cap
on the Medium Brute. Use a screwdriver and the
screwdriver slot in the piston to push the piston rod all
the way forward. This will cause hydraulic fluid to
pour out of the line, so be prepared with a suitable
container. Reinstall the back end cap. Once forward,
cycle the trigger several times – DO NOT bottom it out
– to introduce hydraulic fluid into the cylinder (20+
short cycles).
hydraulic hose is
difficult to bend or coil
(indicating unrelieved
pressure built up in the
hose).
The hydraulic quick coupler
line has not been completely
tightened at the PowerPak
manifold (there should be no
space between the PowerPak
coupler and the hose fitting
flange). See Figure 3.1-2.
Once hydraulic pressure has been introduced to the
hydraulic hose, the pressure must be relieved before the
coupler can be sufficiently tightened.
Procedure for relieving hydraulic pressure:
1. Disconnect the main air supply.
2. Disconnect the hydraulic hose from the PowerPak.
3. Connect Enerpac CT-604 to free end of the hose and
bleed off hydraulic oil to relieve the built-up
pressure. Figure 5.2-2 shows the Enerpac CT-604
Pressure Relief Tool.
4. Once pressure is relieved, reconnect the hydraulic
hose to the PowerPak.
5. Re-attach air lines to get the puller unit to return to
the forward position.
Enerpac CT-604 Pressure Relief Tool
(FTI Part Number 1187-770)
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