HOUSING
•
Disconnect riveter from the air line and remove the pulling
head before attempting disassembly of housing. If piston rod
(1) turns with pulling head, hold it by applying open-end
wrench to flats on end of rod.
•
Remove retaining ring (3) using narrow bladed screwdriver.
Rubber deflector (12) should also be removed.
•
Insert a steel bar approximately 1/2" diameter by about four
inches long through the rear opening until it is solidly against
the end of the drawbolt (9). Strike the end of the steel bar with
a hammer, using sufficient force to drive the entire nose
plate/piston assembly out of the housing.
•
Check rubber cushion (10) and replace if it is flattened thin-
ner than the recess in the piston. Examine all O-rings for
wear or damage and replace where necessary. O-rings (5,
8 & 6-rear) are easily replaced, but to replace the O-ring (6-
front) in the nose plate (4), further disassembly of the nose
plate/piston assembly is necessary. Insert a 5/16" hex
key into the end of the drawbolt (9) and then place the key
securely in a vise.
•
Apply an open-end wrench to the flat of the piston rod (1)
and exert enough force to break the Loctite 271 seal between
the piston rod (1) and the drawbolt (9). With the piston rod
removed from the nose plate (4), the O-ring (6-front) may be
removed. When re-assembling this unit, be sure to apply
Loctite 271 to the threads on the drawbolt (9) and tighten
securely.
•
Re-assembly begins with inserting the two O-rings (6), fol-
lowed by the O-ring (8) on the piston and the O-ring (5) on
the nose plate. All O-rings must be lubricated with a clear
grease such as Parker O-Lube. Exercise care when
installing nose plate/piston assembly back into housing,
being certain to press evenly to avoid pinching the O-rings.
Push the nose plate in until it bottoms on the casting ridge,
exposing the groove to permit insertion of retaining ring (3).
H703 & H743A PULLING HEADS
5
1. Connect the tool to its air supply and without depressing
the trigger, place jaw spring (9) over tube (10) as shown
and insert as far as possible into the head position.
2. Place jaws (2) into collet (6). Screw this assembly onto
the head piston, making sure the tapered end of the jaw
follower (3) is properly aligned in bevel in the back end of
the jaws (2).
3. Thread nosepiece (1) completely into sleeve (4) and
place this assembly over the collet and jaw assembly.
Screw the sleeve (4) into the end of the head body while
depressing the trigger, and tighten snugly.
4. Tighten jam-nut (11) securely.
5. These pulling heads will give long life if properly main-
tained. This includes keeping the head clean and dry, and
all the parts securely tightened. The only lubrication
required is a little grease such as Lubriplate 630-A inside
the cone of the collet to assure a sliding action against
the back of the jaws.
6. In case of damage or wear to pulling head parts,
dismantle and replace with parts selected from the list
below.
