Prior To Reassembly; Main Housing Assembly; Motor Assembly - Stanley IW12 Service Manual

fully slide the reversing spool out of the main housing.
Remove the back-up ring and O-ring with the appropriate
O-ring tool.
5. Remove the 10-24 x 1-3/4-inch/44 mm long socket head
capscrew and locknut (or spirol pin) securing the trigger to
the trigger pivot. Remove the trigger.
6. Pull the needle roller from the spool cap, or unscrew the
spool cap and remove the headed push pin. Remove the
O-rings and wiper.
7. Slide the valve spool, relief seat, relief poppet, sprint rest
and two springs out of the main housing. See the Parts
List section of this manual for clarifi cation, if required. If
the valve sleeve requires replacement, the main housing
should be returned to and authorized Stanley Hydraulic
Tools dealer for repair.
Note:
The valve sleeve will remain in the main housing. It is
not removable.
There is only a small visual difference between the
valve spool used the open-center or closed-center
wrenches. DO NOT confuse them when reassembling
the wrench. An open-center spool has outer ring
widths of less than 0.3 inches/7 mm while the closed-
center spool has outer ring widths of over 0.4-inch-
es/10 mm.
8. Remove the retaining ring at the impact mechanism end
of the main housing. Remove the back-up washer and
O-ring. The O-ring is subject to severe wear and should be
replaced whenever the main shaft is serviced.

PRIOR TO REASSEMBLY

Clean all parts with a degreasing solvent.
Ensure that all seals exposed during disassembly are re-
placed with new parts.
Apply clean grease or O-ring lubricant to all parts during as-
sembly.
Note:
For parts orientation, see the Parts List section of this
manual.
SERVICE

MAIN HOUSING ASSEMBLY

1. Lubricate and install the relief seat in the valve spool
(notched end aligned with strut), followed by the relief pop-
pet, small spring and spring seat (see parts illustration for
correct orientation of the spring seat).
2. Set the large spring on the open end of the reversing
spool.
3. Hold the wrench so the trigger portion faces downward.
Slide the components assembled above into the main
housing.
4. Lubricate and install the two O-rings and wiper on the
spool cap. Insert the headed push pin into the spool cap.
5. Screw the spool cap into the main housing. Tighten
securely.
6. Install the trigger using the 10-24 x 1-3/4-inch/44 mm
long socket head capscrew and locknut (or spirol pin).
1. Lubricate and install the O-ring in the relief adjustment
screw bore in the motor cap.
2. Install the relief adjustment screw with the jam nut posi-
tioned near the screw head. Install with the same number
of turns counted when disassembled to maintain the correct
impact force. Tighten the jam nut. Refer to Impact Adjust-
ment section of this manual.
3. Install the main shaft, idler gear and idler shaft in the
motor cap.
4. Lubricate and install the large O-ring in the groove of the
motor cap.
5. Carefully slide the main housing over the main shaft until
it seats securely against the motor cap.
6. Lubricate and install the eight 3/8-16 x 1-3/4-inch/44 mm
long socket head capscrews and washers. Tighten to a
torque of 22-25 ft lb/29.8-33.9 Nm.
17

MOTOR ASSEMBLY