MAINTENANCE (Continued)
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
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.
The thread in the following step is a
31.Thread the Clutch Adjusting Hole Cover (97) onto the Clutch Housing against the Housing Grip and hand tighten it between 2 and 6
The following step has parts with a
32.Thread the
TESTING THE TOOL
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
Should the stem of the Valve become bent, marred, nicked or damaged in any way during the adjustment process, replace it.
P 7440 Edition 10 | 37 |