Great Plains 3P300 Operator Manual - Manual (Page 51)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 47
09/14/2009 500-103M-A
Ace Pumps
The Ace pump is designed for long life and service. After
some years, a mechanical seal may weep slightly, but if it
starts to drip, the pump will have to be disassembled.
Before disassembly, be sure to wash it out with fresh
water.
If the pump leaks, before removal from sprayer, run the
pump with adequate water in tank to diagnose the actual
pump problem.
Ace Hydraulic Pump Seal Replacement
Refer to Figure 29
Ace Pump Disassembly
1. Remove four 5 ⁄
16
in hex head cap screws from rear
of motor. Remove motor and coupler.
2. Remove rear internal bearing snap ring .
3. Remove four 3 ⁄
8
in x 3 ⁄
4
in hex head cap screws
from mounting frame . Remove volute .
4. Remove 3 ⁄
8
in lock nut from shaft . Insert a flat
file into impeller vane to hold stationary.
CAUTION: Excess torque may cause damage to
plastic impellers.
5. Press shaft out of impeller using one 5 ⁄
16
in hex
head cap screw from step 1. Remove impeller ,
key , and rotating seal member .
6. Press shaft/bearing assembly out of frame.
7. Remove stationary seal member by prying out
with screwdriver or pressing out from motor end of
pump housing.
8. Remove o-ring from shaft groove.
Note: If replacing only the pump seal:
a) Press the shaft /bearing assembly into frame.
b) Reinstall rear internal bearing snap ring.
c) Skip to Assembly step 8.
9. Press bearings off of shaft.
10. Remove forward internal bearing snap ring .
Figure 29
Ace Hydraulic Pump
23373
19
18
11
9
8 2
3 16
16 5
5
15 6
17
20
11