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Always wear eye protection when operating or performing maintenance on this tool.
Always turn off the air supply and disconnect the air supply hose before installing, removing or adjusting any accessory
on this tool, or before performing any maintenance on this tool.
Lubrication
Each time a Series QA 90 x 90 Angle Drill is disassembled
for maintenance and repair or replacement of parts, lubricate
the tool as follows:
1. Coat all exposed gears with Ingersoll Rand No. 67
Grease and work some of the Grease into the gearing of
the Spindle Assembly (41) and Angle Head Assembly (56
and 66).
2. Use Ingersoll Rand No.10 Oil to lubricate the motor.
Inject approximately 1 to 2 cc of oil into the air inlet before
attaching the air hose to the tool.
Speed Adjustment
Series QA 90 x 90 Angle Drills are furnished with the ability to
precisely control speed, within certain ranges. Setting the
speed requires a tachometer. Although the adjustment is
simple, only a competent technician using the proper
equipment should attempt it.
The Back Cap (7) has a small, molded stud on the end face
of the Cap nearest the Exhaust Diffuser (16). Take an initial
Disassembly
General Instructions
1. Do not disassemble the tool any further than necessary
to replace or repair damaged parts.
2. Whenever grasping a tool or part in a vise, always use
leather-covered or copper-covered vice jaws to protect
the surface of the part and help prevent distortion. This is
particularly true of threaded members and housings.
3. Do not remove any part that is a press fit in or on a
subassembly unless the removal of that part is necessary
for repairs or replacement.
4. Do not disassemble the tool unless you have a complete
set of gaskets and O-rings for replacement.
Disassembly of the Tool
Each Series QA 90 x 90 Angle Drill is composed of four
modules including a housing and throttle unit, a motor unit, a
combined gearing with spindle unit and an angle head unit.
The tool can be disassembled for repairs to each individual
unit without disturbing the other units. To separate the
modules, proceed as follows:
1. Lightly grasp the body portion of the Angle Head (56) in
copper-covered or leather-covered vise jaws in a manner
that provides access to the Coupling Nut (51).
NOTICE
The Coupling Nut has a left-hand thread. Rotate the Nut
clockwise to loosen it.
2. Using a wrench on the flats of the Coupling Nut, loosen
the Coupling Nut and then remove the tool from the vise
jaws.
3. With the Angle Head upward, unscrew the Coupling Nut
and pull the assembled Angle Head off the front end of
the tool. Remove the Housing Lock Spacer (49) from the
Angle Head or Gear Case (42).
4. Remove the Grip Spacer (49A) and pull the Grip
Assembly (46) off the Gear Case.
EN-1
WARNING
reading of the tool speed by applying a tachometer to the end
of the Spindle (60) without a drill bit and with the Lever (11)
completely depressed. If the tachometer has a concave tip,
close the Chuck completely; if the tip is convex, open the
Chuck completely.
After determining the actual velocity, shut off the air supply
and disconnect the airline. Use a 3/4" wrench to loosen the
Inlet Bushing (17). The longest slot in the Exhaust Diffuser
will contain the molded stud on the Back Cap. Rotate the
Diffuser to open the exhaust ports to increase speed or rotate
it to restrict the exhaust to reduce speed. Being careful not to
allow the Diffuser to damage the molded stud, tighten the
Inlet Bushing to 15 ft-lbs. (20 Nm) torque. Connect the airline
and restore the air supply and check the velocity again.
Determine which direction you need to rotate the Diffuser to
obtain the desired speed and then rotate it accordingly. Best
results are achieved by using gradual increments and
frequent tachometer readings. Be sure to turn off the air
supply and disconnect the line when making adjustments.
5. Lightly grasp the flats of the Motor Housing in
leather- covered or copper-covered vise jaws with the
Inlet Bushing (17) upward.
6. Place a 1-3/16" wrench on the flats of the Back Cap (7) to
prevent it from rotating, and use a 3/4" wrench to
unscrew and remove the Inlet Bushing.
7. Lift the Exhaust Diffuser (16) off the Back Cap.
8. If the Throttle Valve Spring (15) did not come out of the
tool with the Inlet Bushing, use needle nose pliers to
remove it and the Throttle Valve (14) from the Motor
Housing.
9. If the Throttle Valve Seat (13) is damaged and must be
replaced, insert a hooked tool through the central
opening of the Seat and pull it from the Motor Housing.
10. Using a 1/16" pilot punch, tap the Throttle Lever Pin (12)
out of the Back Cap and remove the Throttle Lever (11).
11. Pull the Throttle Plunger (6) out of the Motor Housing and
remove the assembly from the vise.
12. Holding the assembly horizontally, remove the Back Cap,
the Memory Chip (10) (if included with the tool), and the
Back Cap Gasket (8).
13. If the Muffler Elements (9) need to be cleaned or
replaced, pull them out of the Back Cap.
14. Grasp the flats at the inlet end of the Motor Housing in
leather-covered or copper-covered vise jaws, and using a
1-1/16" wrench on the flats of the Gear Case, unscrew
and remove the Gear case from the Motor Housing.
15. Set the assembled Gear Case on the workbench.
16. Remove the Motor Clamp Washer (33) and the Motor
Seal (32) from the assembled motor in the Housing.
17. Tap the Motor Housing on a block of wood to remove the
Motor Assembly from the Motor Housing.
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