Service; Prior To Disassembly; Impact Mechanism Removal, Cleaning & Installation; Removal - Stanley IW12 Service Manual

Good maintenance practice keeps the wrench on the job
and increases its service life.
The most important maintenance practice is to keep the hy-
draulic fl uid clean at all times. Contaminated hydraulic fl uid
causes rapid wear and/or failure of internal parts.
Follow the procedures contained in the Hydraulic System
Requirements section of this manual to ensure peak perfor-
mance from the tool.
Never disassemble the main housing unless proper trou-
bleshooting procedures have isolated the problem to an
internal part. Then, disassemble the tool only to the extent
necessary to replace the defective part. KEEP CONTAMI-
NANTS SUCH AS DIRT AND GRIT AWAY FROM INTER-
NAL PARTS AT ALL TIMES.
Always determine and correct the cause of the problem
prior to reassembly. Further wear and tool failure can result
if the original cause is not corrected.
IMPORTANT
The impact mechanism is subject to grease "squeeze
out". Impact heat accumulation, centrifugal force
throwing the grease away from moving parts and an
expansion pressure pushing lubricant out the anvil
bushing. Maintenance intervals vary with daily cycles,
impact energy intensity and lubricant quality. It is very
important that an inspection schedule be established
to ensure that parts inside the mechanism are well
lubricated. Be sure to remove any grease that ap-
pears to be burned. Make sure grease is packed
around all parts.

PRIOR TO DISASSEMBLY

Clean the exterior of the tool.
Obtain Impact Grease (part number 02718 for Land Mod-
els and Waterproof Impact Grease part number 03201 for
Underwater Models).
Obtain Seal Kit part number 08073 or 13695 so all seals
exposed during disassembly can be replaced during reas-
sembly.

SERVICE

IMPACT MECHANISM REMOVAL,
CLEANING & INSTALLATION

REMOVAL

1. Remove the four 3/8-16 x 1-3/4-inch/44 mm long socket
head capscrews and lockwashers securing the hammer
case assembly to the main body assembly.
2. On underwater models, loosen and remove the 10-24 x
1-3/4-inch/44 mm long socket head capscrew and locknut
(or spirol pin) securing the lower end of the trigger guard
to the main housing assembly and swing the trigger guard
away.
3. Hold the wrench with the impact mechanism pointing
down and depress the trigger while pulling the hammer
case, gasket and impact mechanism away from the hous-
ing assembly.
4. Remove the thrust bearing and two thrust races, if they
were not removed with the impact mechanism.
5. Turn the hammer case (anvil up). The impact mechanism
components will drop into your hand.
6. Remove the two hammer pins from the hammer frame.
The hammer and anvil can be removed at this time.

INSTALLATION

1. Thoroughly clean all parts of the mechanism.
2. Using the correct impact grease lubricate the inside of
the hammer frame and install the hammer, anvil and two
hammer pins. The inside of the hammer case should be
free of grease to avoid over-lubrication.
3. Lubricate the hammer case bushing and slide onto the
anvil.
4. Grease the thrust bearing and thrust races. Install the
thrust race, thrust bearing and remaining thrust race on the
main shaft in this order.
5. Install a new hammer case gasket (or O-ring). On under-
water models, lubricate and install the O-ring in the ham-
mer case bushing bore. Slide the hammer case assembly
onto the anvil and secure with the four 3/8-16 x 1-3/4-
inch/44 mm long socket head capscrews and lockwashers.
Tighten to a torque of 13-15 ft lb/17.6-20.3 Nm.
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