Ingersoll-Rand LEVER IN-LINE AIR SCREWDRIVER QS1L Manuale Utente

P 7440 Edition 10

37 

20. Using needle nose pliers, insert the Throttle Valve 

(13), long stem leading, into the opening against the 

Seat. Center the Valve in the Seat.

21. Install the Throttle Valve Spring (14) in the opening 

so that it encircles the Valve.

22. The Exhaust Diffuser (15) has one slot that is longer 

than the other five slots. The Back Cap has a short, 

molded stud projecting from the inlet end. Place the 

Exhaust Diffuser against the Back Cap with the long 

slot encircling the molded stud. Rotate the Diffuser 

counterclockwise until the wall of the slot stops 

against the stud. The exhaust ports are now in the full 

open position which will provide maximum free speed.

23. If the Inlet Screen (18) required replacement, use a 

wooden dowel to carefully push a new one into the 

Inlet Bushing (16).

24. If the Inlet Bushing Seal (17) is nicked or damaged, 

carefully install a new one over the threads of the Inlet 

Bushing.

25. Thread the Inlet Bushing Assembly through the Dif-

fuser and Back Cap into the Motor Housing. Using a 

1-3/16” wrench on the flats of the Back Cap to keep it 

from turning, tighten the Inlet Bushing between 15 

and 20 ft-lbs. (20 and 27 Nm) torque.

26. The Throttle Plunger ( 5) has a lengthwise flat on the 

outer edge at one end of the Plunger. Insert the 

Plunger, flat end first, into the cross hole in the Hous-

ing. Push on the end of the Plunger to make certain it 

springs back from contact with the stem of the Throt-

tle Valve.

27. Position the Throttle Lever (10) in the slot in the Back 

Cap and Motor Housing and using a 1/16” diameter 

rod, align the holes through the Back Cap, Motor 

Housing and Throttle Lever. While maintaining align-

ment, install the Throttle Lever Pin (11) in place of 

the rod by tapping it through all three pieces.

28. Remove the tool from the vise jaws and install the 

Housing Grip (93) over the Clutch Housing.

29. Install the Grip Retaining Ring (96) in the external 

groove on the Clutch Housing ahead of the Grip to 

retain the Grip on the Housing.

30. For Models with Quick Release Bit Holders, place the 

Bit Retaining Ball (85) in the hole through the wall of 

the Bit Holder and slide the Bit Retaining Sleeve (88), 

large end trailing, onto the Bit Holder. Slide the 

Retaining Sleeve Spring (89) and Spring Seat (90) 

onto the Bit Holder and secure the components by 

installing the Retaining Ring (91) in the external 

groove at the output end of the Bit Holder.

31. Thread the Clutch Adjusting Hole Cover (97) onto 

the Clutch Housing against the Housing Grip and 

hand tighten it between 2 and 6 ft-lbs. (3 and 8 Nm) 

torque.

32. Thread the Non-Rotating Bit Finder (92) or Clutch 

Housing Cap (98) onto the Clutch Housing and hand 

tighten it between 2 and 6 ft-lbs. (3 and 8 Nm) torque.

Before placing the tool back in service, test the tool in a 

run down application to determine if adjustments are 

necessary to satisfactorily perform the operation. Since five 

interrelated adjustments can affect tool performance, only 

experience, along with trial and error, can dictate which 

adjustment or combination of adjustments will provide the 

desired results.
The Clutch Spring (59 or 75), the clutch adjustment 

procedure, the exhaust flow, the length of the Push Rod 

(34) and the length of the Shutoff Valve (20) can 

individually or collectively have an effect on torque and/or 

speed. Always try to make adjustments before replacing or 

attempting to modify components. If adjustments are 

unable to provide the desired torque, it may be necessary 

to install a lighter or heavier Clutch Spring.
If the tool ratchets when operated but fails to shutoff, it 

may be necessary to shorten the Push Rod. Only shorten 

the Push Rod in small increments. Increments between 

0.005” and 0.010” (0.13 and 0.25 mm) are recommended. If 

the tool stalls and does not shutoff, runs slower than 

normal or has low power, the Shutoff Valve may require 

lengthening. To lengthen the Shutoff Valve, grasp the stem 

between two pieces of rubber or other non-slip, non-

marring material and rotate the molded nut 

counterclockwise. Rotating the nut one half revolution will 

lengthen the Valve approximately 0.009” (0.23 mm).
Should the stem of the Valve become bent, marred, nicked