8
DISASSEMBLY—MOTOR UNIT:
Clamp the handle in a vise with the motor housing upwards.
Unscrew both the motor housing 382509 and the turnbuckle
collar 382508 in unison from the handle. Tap motor and motor
housing on wooden bench top to remove motor unit. Hold
either the pinion gear 617609 or rotor nut 382522 and unscrew
(left hand threads) the governor assembly. Remove the rear
bearing 864522, bearing plate 867369, cylinder 867377, and
three (3) rotor blades 382520. Note: Check the function of the
rotor blade kickout pins at this time. Blades should stick out
approximately 1/8". If required, the spring cap 382514 must be
drilled and tapped for removal. Clamp the body of the rotor in
the vise and unscrew the pinion 617609 or nut 382522.
Before disassembling the governor, note which "step" the
adjustment ring pin 867187 is "on" in the adjustment ring
867214. Depress the adjustment ring and remove the pin.
Remove the pin retainer 864532 and remove the two (2)
governor weight pins 867184.
DISASSEMBLY—MOTOR BACKHEAD
Important Note: Pressure cap 382507 must not be unscrewed
while the motor backhead is connected to air supply. This
cavity is supplied with high pressure air whenever the backhead
is connected to the air system. Remove pressure cap, spring
864681, ball 812156, and pin 847031. Rapid advance valve
382501 may be removed by unscrewing valve cap 382502 and
removing retainer ring 869460. The rapid advance lever 382503
may be removed by unscrewing (3/16" hex) the flat head cap
screw 382504.
DISASSEMBLY— HANDLE
Unscrew plug 864387 and remove drill button spring 622833.
Depress the drill button 382484 and use a 1/8" diameter rod to
unscrew button guard 382671.
Unscrew inlet bushing 867758 and remove spring 863072 and
throttle valve 202365.
Unscrew end cap 382668 and spring 382489. Push out throttle
piston 382677.
Screw a 1/4-20 cap screw into the metering seat 382491.
Clamp the cap screw in the vise and use a soft faced hammer
to drive the handle off.
Filter 382505 located in 13/32" dia. hole adjacent to the
metering seat should be checked and replaced if necessary.
The emergency stop button 381243 should not be removed
unless the O-ring 844301 needs replacing. Clamp the stop
button in the vise and use a soft faced hammer to drive the
handle off. Tap the bushing 202354 with a 1/4-20 thread.
Screw a 1/4-20 bolt in the vise. Drive the handle off.
Unscrew the check valve seat 382487 and remove O-ring
844302, 3/16" steel ball 842161 and check valve spring
382488. NOTE: Spring is very small.
FOR VARIABLE SPEED TOOLS,
SEE PAGES 10 AND 11
REASSEMBLY— GENERAL
The tool is reassembled in the reverse order of disassembly.
Clean all parts thoroughly in a solvent and inspect for damage
or wear. Check all bearings for wear which can be detected by
excessive end play and/or roughness which would indicate a
brinelled condition. Inspect and replace any O-ring that is
damaged or worn. Rotor blades should be replaced at every
repair cycle or if they measure less than 1/4" (6.35mm) at
either end. All gear teeth, bearings, and pins should receive a
close inspection and be replaced if necessary.
All gears and bearings in the planetary gear train should
receive a generous amount of NLGI 2-EP grease during
reassembly.
All gears and bearings in the right angle drill head should
receive a generous amount of "Lubriplate #907" grease during
reassembly.
Lubricate all O-rings during reassembly with 10W machine oil.
HANDLE REASSEMBLY:
Insert throttle piston 382677 (with O-rings) into throttle piston
cylinder 382676. Replace spring 382489 and end cap 382668.
Rotate the throttle piston 382677, to line up the slot for the
throttle valve 202365. Replace spring 863072, O-ring, and
inlet bushing 867758. If the screen in the inlet bushing is torn
or clogged, replace the inlet bushing.
Insert spring 382489, O-ring 844307, and latch piston 382490,
into handle. Line up the air ports in the metering seat 382491,
and handle 382480, and tap the metering seat into the handle
until the shoulder on the seat is flush with the surface of the
handle. Use a 1/4-20 bolt to tap or press the metering seat.
Install the drill button and shaft assembly 381171, using a
thread retaining compound. Install the drill button spring 622833
and plug 864387 with O-ring.
Press the stop button assembly 381243, into the handle until
the shoulder on the bushing is flush with the handle.
