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8
REV. 2/14
TROUBLE SHOOTING
Providing all maintenance conditions have been met, follow this systematic approach to diagnosis.
1. MORE THAN ONE PULL IS REQUIRED TO BREAK RIVET.
a) Tool needs to be bled. (See filling and bleeding instructions.)
b) Spring has fatigued, replace.
c) Jaws are stripped or packed with chips. Clean or replace.
d) Incorrect nose tip.
2. SLOW OR PARTIAL OPERATION WHEN THE LEVER ASS’Y (724017) IS DEPRESSED
a) Polyseal (A-1134) and o’ring (400791) could be worn or damaged. Replace.
b) Back-up ring (401102) and o’ring (S945) could be worn or damaged. Replace.
c) Muffler (704146) or filter inside valve spool ass’y (703142) may be plugged with dirt. Clean thoroughly and back-blow with
compressed air.
d) Hole in metering screw in valve spool ass’y (703142) may be blocked or damaged. Hole diameter should be .028". Clear
and size or replace.
3. NO OPERATION WHEN LEVER ASS’Y (724017) IS DEPRESSED
a) Tool seized due to mechanical failure or damaged parts.
4. OIL LEAKAGE
a) DO NOT OPERATE WITH OIL LEAKING FROM TOOL. HIGH PRESSURE OIL MAY CAUSE SEVERE PERSONAL INJURY.
b) Any oil leaking externally should be traced to its source. An o'ring or seal that leaks should be replaced.
5. AIR BYPASS FROM VALVE HOUSING
a) If the spring (704141) breaks or dislodges, air will flow freely through the muffler (704146). Replace or reset. Valve spring
installation tool (704162) is recommended.
b) Check o'rings on valve sleeve (703139), valve spool ass’y (703142), and valve plug (704145). If worn or damaged, replace.
Valve sleeve removal tool (704163) is recommended.
6. FASTENER STEM JAMMED IN NOSE ASSEMBLY
a) Nose assembly components require service. DISCONNECT AIR FROM TOOL, remove the nose from the tool and
disassemble. Replace worn or broken parts. Clean the surface the jaws ride on.
b) Stems lodged side by side in the follower. Disassemble, remove stems, and reassemble.
c) Incorrect follower.
OVERHAUL
The disassembly and re-assembly procedure can be accomplished by utilizing the following instructions and drawings. Use extreme
care during disassembly and re-assembly not to mar or nick any smooth surface that comes in contact with seals. Before installing
seals, always apply a good lubricant, such as Lubriplate®
,
to the surfaces. It is recommended that tool kit (GB704TK) be used to
facilitate overhaul. A complete overhaul can be achieved by the use of Service Kit 752022 which contains a complete set of o'rings,
back-up rings, screws, washers and gasket.
WARNING
DEPRESS LEVER ASS’Y (724017) AND DISCONNECT FROM AIR WITH HEAD PISTON IN THE REAR POSITION BEFORE OVER-
HAUL. SEVERE PERSONAL INJURY MAY OCCUR IF AIR HOSE IS NOT DISCONNECTED.
USE CAUTION
WHEN FORCING PISTON
ROD ASSEMBLY DOWNWARD WITH HEAD CYLINDER ASSEMBLY REMOVED, HYDRAULIC FLUID WILL EJECT FORCIBLY FROM
HANDLE.
(704214 CATCHER BAG SHOWN ABOVE IS SOLD SEPARATELY)
Part No.
Description
704149
Piston Rod Wrench
704150
Packing Plug Wrench
704151
Power Cylinder Tool
704152
Seal Guide
704153
Bleeder Bottle
S1178
Valve Extractor
744251
Valve Spring Installation Tool
744152
Valve Sleeve Removal Tool
GB740TK Service Tool Kit Includes:
704214
STEM CATCHER BAG
704149
PISTON ROD WRENCH
704151
POWER CYLINDER TOOL
704152
SEAL GUIDE
704150
PACKING PLUG WRENCH
704153
BLEEDER BOTTLE
744251
VALVE SPRING
INSTALLATION TOOL
744152
VALVE SLEEVE
REMOVAL TOOL
S1178
VALVE
EXTRACTOR