TM-G84
Rev.: H DCR# 15-0406
DATE: 5/5/15
Federal Identification Code: 11815
© 2015 Cherry Aerospace
HANDLE SUB-ASSEMBLY
Disassembly:
•
Remove parts (65) through (69). Remove screws (76). Lift head assembly from the handle (33); empty and dispose of fluid
according to environmental regulations.
•
Unthread the locknut (64) with a 1/2" socket wrench and then remove the air piston (63) by using wrench 700B65; hold the top
of the piston with tool 700A61 to prevent from turning. Push piston out when completely unthreaded
•
Push the power piston (79) all the way up and remove packing plug (59) with the help of wrench 700B65.
•
Tap the power cylinder (37) from the top; when loosened, it will fall through the bottom.
•
Remove all the seals using a bent hook tool.
Assembly:
•
The re-assembly sequence is the opposite of disassembly; to prevent damage to piston threads, the tightening torque for the
locknut (64) must be between 50 and 59 in.-lb. (5.65 and 6.67 N-m).
TROUBLESHOOTING GUIDE
PROBLEM
POSSIBLE REASONS / SOLUTIONS
Piston does not move after depressing Trigger
- No air supply is connected:
Connect to a clean, filtered air source at 90 to 110 psi (6,2 to 7,6 bar).
- Faulty trigger:
Remove and replace trigger assembly.
- Broken power piston:
Service the Handle Subassembly.
Short stroke or low pull force
-
Significant fluid loss:
Bleed the system to purge the air out.
If performance doesn’t improve, or excessive leakage continues, see below.
Head Cylinder Fluid leakage
-
Leaks around the seals or fittings indicate that they are not tightened to seal
properly:
Tighten until no more leaks are observed.
-
Leaks at the front or back of head cylinder indicate worn/ damaged seals
Service head cylinder per instructions provided herein
Air leakage at the spool valve
-
Broken or dislodged valve spring.
-
Worn or damaged valve spool seals:
Disassemble and service air valve per Air
Sub-Assembly Overhaul Instructions.
Head piston is slow or seizes
- Piston or seal damage
: Service head cylinder.
-
Oil bypassing due to power piston displacement off its seat:
Service Handle
Subassembly per instructions provided below.
-
Clogged air muffler or filter
Clean thoroughly with solvent and back-blow with
compressed air.
Head Piston (64) does not return fully forward
even after system bleeding
-
Pressure relief valve (78) malfunction:
Remove, inspect and clean components
thoroughly. Replace seals and damaged components.
-
Return Cylinder Spring (34) is damaged or broken:
Remove head assembly and
replace the damaged spring. Re-assemble, fill and bleed per page 6.
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