HALE AP, Technical Manual

Page: 97 / 177

85
Perform the following to remove and replace AP pump impeller.
Impeller Removal
A. Remove cotter pin that secures impeller nut.
Using flat blade screwdriver, pry bent portion of cotter pin so bend can be 1.
cut off.
Using heavy wire cutters, cut off bent portion of cotter pin. (Or using ply- 2.
ers, bend cotter pin straight.)
Using plyers (or hammer and pin punch), pull (or drive) cotter pin out of 3.
castle nut.
B. Remove impeller nut.
If using a 1 3/4-in socket and impact driver (set CCW): 1.
a) Hold impeller by hand. (Use proper PPE.)
b) Using 1 3/4-in socket and impact driver (set CCW), loosen castle nut.
If using a 1 3/4-in (or adjustable) wrench and strap wrench: 2.
a) Hold impeller with a strap wrench.
b) Using 1 3/4-in (or adjustable) wrench, loosen (turn CCW) castle nut.
Remove castle nut. 3.
DO NOT STRIKE THE IMPELLER. STRIKING THE IMPELLER MAY RESULT IN IRREPA-
RABLE DAMAGE.
C. Remove impeller.
Pull impeller off pump shaft by hand if possible. 1.
If impeller can NOT be removed by hand, use wedges and puller to pull 2.
impeller. Loosen impeller as follows:
a)
Install puller (See APPENDIX B, Test Equipment And Special Tool Information) on
impeller.
b) Place 1/2-in (M12) flanged nut (flange toward pump shaft) between pump shaft
and puller drive screw (protects shaft threads).
c) Using a wrench (or socket and ratchet), tighten puller drive screw until impeller
comes loose.
d) Remove 1/2-in (M12) flanged nut and puller.
Then pull impeller off pump shaft by hand. 3.
Remove impeller/pump shaft key. 4.
D. Inspect and clean all components. See paragraph 5.7.7, Cleaning And In-
spection Guidelines. (See page 51.)
If inspection indicates the clearance rings require replacement see para- 1.
graph 5.8.7.2, AP Pump Clearance Ring R&R. (See page 110.)
If inspection indicates the impeller requires replacement see para- 2.
graph 5.8.4.7, Impeller R&R. (See page 83.)