
HEAD CYLINDER SUB-ASSEMBLY (744-202)
Caution: Remove Pulling Heads or other attachments before attempting to disassemble.
Disassembly instructions:
Remove screw (57) and unscrew lock ring (58) with spanner wrench 530-202.
Drainthefluidover an oilpan; dispose according to environmental regulations.
Remove rear stop (59) and piston (63) by pressing them out of the rear of the subassembly.
Remove seals(60, 61, 62, 63, 65, 66, 67 & 68)carefully using a benthook tool.
Assembly instructions:
Inspect allcomponentstomakesure all surfaces arecleanand freeof burrs.
Install O-ringand back-up ring (67& 68) intogroove of head cylinder (70).
Thread seal guides 744-194 & 744-195 onboth sidesof the piston (64).
Mount O-ring andback-up ring (65& 66) onto the piston (64).
Carefully push/twist piston (64) intothe headcylinder (70) bore, pressing it allthewayin.
AssembleO-ring, backup ring (60& 61) and O-ring, Back-up ring (62&63) ontorear stop (59) andcarefully
pressitintothe headcylinder.
Thread-inlockring (58)using spanner wrench 530-202and secureit with screw (57);
use Loctite® 242on threads. Remove seal guides.
Swivel Assembly Instructions:
Apply Loctite 545on themalethreads of swivel (75).
Thread swivel (75) into head cylinder(70) and thread untilhand tight.
Using a 7/16 wrench, tighten threads by rotatingone fullturn from initial threadseating
tosecurein place – Do notovertighten.
AllowLoctitetocurefor 24 hours for full strength.
HANDLE SUB-ASSEMBLY (744-189)
Disassembly Instructions: Make sure that the air supply is disconnected before proceeding.
Unscrewcap screws (19) and removemanifold(35);
Drainthefluidcompletelyintoa pan anddispose accordingtoenvironmental regulations.
Remove gasket (22) andO-rings(21)
Remove retaining ring (1)and the base cover (2) from the bottom of the unit.
Remove retaining ring (3)and carefully pryhandle base (4) from thebottom of the unit, using a screwdriver.
Engage wrench 700A61 intothehex socket of the piston rod cap(26).
Remove locknut (6) with a ½inch (13mm) socket, while holdingwith the wrench; unscrew air piston (7) by using
wrench530-201anda1inch(26mm)socket.
Pullthe air piston(7) out through thebottom of the unit withthe helpof thetool P1178.
Remove powerpiston subassembly (84) throughthe top of the handle (18) usingthe guide tool 744-104.
Remove thepacking plug (11) with the helpof wrench530-201 and a 1¼ inch (32 mm) Socket.
Note: Toloosenit, holdthe handleupsidedown in avise, if necessary.
Remove theO-rings (12 and 13)and back-up rings(14) with athin, bent hook.
Placean 1inch(25,4mm)rod on top of power cylinder (17) andtap it out carefully throughthe bottom of theunit
with amallet.
Assembly Instructions: LubricateO-ringswithParker®siliconeO-ringlube or equivalent and handle allseals with care.
Makesure thegasketsand sealsarein goodcondition andare placedcorrectly.
Insert the power cylinder (17) withO-rings(15 & 16) intothe handle(18) bore through the bottom of handle. To
properly seat it, place an 1inch(26 mm) bar against itsbottom surface, andcarefully tapinto place with amallet.
Insert O-rings(13) and back-uprings (14) inpacking plug (11).
Thread packing plugin tightlyagainst the power cylinder (17) using wrench 530-201 and a1 ¼ inch (32 mm)
socket.
Thread seal guidetool 744-104intothe end of thepower piston (25) thenpush intothe boreof the powercylin-
der (17) through thetopof handle(18).Tapitthoughthepacking plug (11) with amallet; remove the seal guide.
Using wrench530-201 insert air piston (7) with quad ring (9) and back-up rings(8) intothemain bore of the han-
dle (18) untilit engagesthe threadedend of the power piston (25); tightenthem together wrench 700A61.
Thread and tighten locknut (6) onto power piston (25) with a ½” socket (13 mm) at 50 to 59 in-lbs (5,65
to 6,67 N-m).
Insert handle base (4) withlubricatedO-ring (5) intothe bottom of thehandle (18) and tap it intoits seat.
Placeretainingring (3), basecover(2), andretaining ring (1).
Pushthe piston downwardswith the helpof wrench700A61.
Fill the handle subassembly withfluidtoabout 1/8inch(3mm)above thetop of thepowerpiston(17).
Place new gasket & O-rings(21,22) ontop of handle (18); mount the manifold(35) tightening screws (19) evenly.
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