Ingersoll-Rand QA6 series, Maintenance Information, Page: 84 / 94

84 16601056_ed1
Assembly Instructions for Assembly (H) and (I)
Guide other end of the Push Rod of Assembly (I) into Driver Shaft’s hole of the Assembly (H). Make sure that the push rod sits into the
plunger’s hole placed in the driver shaft. Thread Gear Case with the Clutch Housing counterclockwise by hand.
Adjustment of Push Rod Gap
Pushrod length controls the shutoff valve spacing in the backend housing of the tool. This spacing provides the proper air supply to the motor
and controls the timing of the clutch mechanism. for best operation of tool, please follow the instructions below.
NOTICE
Replacement of any component between the shutoff valve and second stage gearing may change the tool’s operating valve gap. to
minimize down time, it is recommended to order a pushrod when replacing parts between these areas. During any assembly up to the
second stage, recertify correct gap using this procedure.
Note
: Pushrods that are too short will decrease motor performance and may cause tool to stall. Also, pushrods that are too long may cause tool
to ratchet and not shutoff. This is why pushrod length is so important.
Connect tool to air supply.
with the second stage hand tight, turn the tool on and slowly unscrew the second stage from the clutch housing (clockwise) until tool stops.
Note
: If tool does not run when lever is initially pressed, pushrod is too short and needs to be replaced.
Release tool lever to reset air pressure. Repress lever and slowly tighten second stage until tool starts to rotate. from this point mark the
housing to identify number of revolutions until it is hand tight (counterclockwise).
Note : Valve gap can be measured based on number of revolutions. 1 revolution = 1 mm of valve gap.
Verify proper valve gap for the tool:
QA6 = 0.75 mm to 1.0 mm = 0.75 revolutions to 1.0 revolutions
QA8 = 1.0 mm to 1.25 mm = 1.0 revolutions to 1.25 revolutions
5. If the valve gap is less than the value in step 4, a new longer pushrod must be used and repeat steps 1-4.
6. If the valve gap is too large, take the actual number of revolutions measured in step 3 and subtract the maximum revolutions in step 4. Take
this value and subtract it from the pushrod length to get the length the pushrod needs to be cut.
7. Repeat steps 1-6 until you have correct length.
e.g . If the number of revolutions in step 3 comes out 1.5, then grind pushrod from 0.5 mm to 0.75 mm for QA6 tool and 0.25mm to 0.5mm
for QA8 tool.
8.
Tighten second stage Gear Case with Clutch Housing counterclockwise to 70 Nm (52 Ft-Lb).
1.
1.
2.
3.
4.