13-8-619 Page 36
REPLACING THE COMPRESSOR SHEAVE AND SHAFT SEAL (Figure 7-1, page 35)
1. Disconnect, lockout and tagout the power supply to the starter.
2. Remove the guards.
3. Using the adjusting screws, jack the motor base up to loosen the belt tension, Remove the belts.
4. The mounting bolt of the sheave has a left hand thread. The bolt can be loosened by giving the
handle of the hex socket key a sharp blow with a hammer. Open the screw only by about 1/4”.
5. Pull the sheave off the rotor shaft with a gear puller.
6. The wear sleeve will come off with the sheave.
7. Always replace both the sleeve and the shaft seal. The sleeve is removed by tapping it off with a
drift, through the three holes in the sheave.
8. When installing the sheave or shaft seal, carefully clean the shaft end and the seal housing surfaces.
9. Apply a coat of Loctite 542 or 545 to the outside diameter of the shaft seal. Install the shaft seal
using a suitable drift.
10. Install the wear sleeve onto the rotor shaft with a suitable drift.
11. Apply a thin coat of Loctite 609 to the sheave surface that will be against the inside of the sleeve,
press the sleeve into place and install the pulley using the mounting bolt. Torque bolt to 60 ft-lbs.
12. Install new belts. Check for correct belt tension and re-attach the wire guard.
13. Align sheaves with a straight edge. (See “Sheave Alignment”).
14. Assemble the guards
SHEAVE ALIGNMENT
The sheave alignment and belt tightening system consists of a hinged plate for the motor which is
supported between (2) posts and a slotted platform for the Tempest units. To achieve proper sheave
alignment the sheaves must be adjusted for both parallel and angular alignment. The alignment between
the motor and air-end sheaves should be confirmed with the use of a straight edge. If the sheaves are
properly aligned, the straight edge should touch the two outer edges of each sheave for a total of four
points of contact. Gaps between the outer edges of either of the sheaves and the straight edge indicate
sheave misalignment.
The airend sheave is set in the parallel and angular direction by mounting it on the air-end shaft that is
part of the Tempest unit that is bolted to the platform. The platform has been set in the parallel and
angular directions by its inherent design. The motor sheave is set in the parallel direction by sliding it on
the motor shaft to position it in line with the airend sheave. (Check for alignment with straight edge.)
Note: It may be necessary to loosen the Tempest unit and slide it in the platform mounting slots to keep
the motor sheave fan blades in the correct position in the cooler orifice ring.
The motor sheave is set in the angular direction by means of (2) jack bolts and the hinged plate. To start
the angular alignment process check to make sure the locking nuts on the jack bolts are loose. The
motor sheave can be aligned in the angular direction to the same plane as the airend sheave by turning
down the jack bolts on one side or the other of the hinged plate. (Check for alignment with straight edge.)
It also
may be necessary to use the nuts that are on the jack bolts to push up on one side or the other of
the hinged plate. Note: At this point it may also be necessary to make minor adjustments of the position
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