TM 5-3895-374-24-1
GP325FA
The following procedures should be followed when it becomes necessary to Inspect or replace the impeller on a Hauck
blower. The numbers in parentheses refer to items depicted in figure 1.
CAUTION
Ensure that the electrical power cannot be accidentally applied to the motor while the casing
Is disassembled.
1.
Remove both self-tapping screws (22) holding the front half of the casing to the outlet adapter.
2.
Remove all of the hex head bolts (14) located around the casing flange.
3.
Separate the two halves. The two halves are factory sealed with a resin coating. To facilitate their separation, it is
recommended that a knife be drawn along the joining edge of the halves. Moderate force may be required to
overcome the seal between the casing halves.
4.
Loosen the three setscrews (5) at the rear of the Impeller hub. DO NOT REMOVE THE STUD OR LOCK NUT AT
THE CENTER OF THE IMPELLER.
5.
Pull the impeller from the motor shaft. The key will separate from the motor shaft and impeller hub keyways. (Do not
misplace the key as it will be reused.).
6.
Inspect the Impeller and replace if necessary.
7.
Clean any burrs from the shaft caused by the setscrews. If necessary, use an emery cloth to re- tore a smooth
surface.
8.
Apply an antiseize compound to the Impeller hub bore and the shaft.
9.
Place the motor shaft keyway at the 12 o’clock position and insert the key.
10.
After ensuring that the impeller hub keyway is aligned with the key on the motor shaft, slide he impeller on the shaft.
11.
Replace the front half of the casing and tighten all casing hex head bolts (14).
NOTE
In order to ensure an effective air seal, It Is important that a suitable caulking (we recommend
"STRIP CAULK" by 3M) be placed between the outlet adapter and the casing halves for a short
distance in each direction. Suggested approximate area of caulking is shown In figure 1.
12.
Replace the self-tapping screws (22) which hold the front half of the casing to the outlet adapter.
IMPORTANT
It is important to reinsert the key before attempting to tighten the impeller set screws. Failure
to do so will prevent proper tightening of the key set screw. It is also imperative that the
sequence and torquing procedure outlined be followed exactly. Failure to sufficiently tighten
the set screws may allow the Impeller to further loosen during operation of the blower, while
excessive tightening may damage the set screws as well as impair their effectiveness.
(page 3-552)
