Maintenance Section; Speed Adjustment - Ingersoll-Rand QS511 Operation And Maintenance Manual

Always wear eye protection when operating or per-
forming 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 QS Drill is disassembled for mainte-
nance 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 (40).
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 QS Inline Drills are furnished with the ability to
precisely control speed, within certain ranges. Setting the
speed requires a tachometer. Therefore, the adjustment,
although simple, should only be attempted by a competent
technician using the proper equipment.
The Back Cap (6) has a small, molded stud on the end
face of the Cap nearest the Exhaust Diffuser (15). Take
an initial reading of the tool speed by applying a tachome-
ter to the end of the Chuck (50) without a drill bit and
with the Lever (10) completely depressed. If the tachom-
eter 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 sup-
ply and disconnect the air line. Use a 3/4" wrench to
loosen the Inlet Bushing. 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 air line and restore the air sup-
ply and check the velocity again. Determine which direc-

MAINTENANCE SECTION

tion 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.
General Instructions
1.
2.
3.
4.
Disassembly of the Tool
Each Series QS Lever Inline Drill is made using three
modules or units which include a housing and throttle
unit, a motor unit and a combined gearing with spindle
unit. The tool can be disassembled for repairs to each
individual unit without disturbing the other units. To sep-
arate the modules, proceed as follows:
1.
2.
3.
16
DISASSEMBLY
Do not disassemble the tool any further than neces-
sary to replace or repair damaged parts.
Whenever grasping a tool or part in a vise, always use
leather- -covered or copper- -covered vice jaws to pro-
tect the surface of the part and help prevent distor-
tion. This is particularly true of threaded members
and housings.
Do not remove any part which is a press fit in or on a
subassembly unless the removal of that part is neces-
sary for repairs or replacement.
Do not disassemble the tool unless you have a com-
plete set of gaskets and o- -rings for replacement.
Remove the Chuck (50) using the following tech-
nique:
a) Insert the short leg of a 1/4" hex wrench into the
jaws of the Chuck and tighten the Chuck.
b) Using a brass hammer, sharply rap the long leg of
the wrench in a counterclockwise direction to
loosen the Chuck.
c) Unscrew and remove the Chuck from the spindle.
Use a thin blade screwdriver to spiral the Grip
Retainer (42) out of the groove in the Gear Case (41)
and pull the Housing Grip (43) off the front of the
tool.
Using a wrench on the flats of the Gear Case, un-
screw and separate the Gear Case from the Motor
Housing (1).