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UNIT DISASSEMBLY
11
The instructions contained in this section cover a complete teardown of the subject
pump. Disassemble only as far as necessary to replace or repair any worn parts.
CAUTION
: On 24 series units relax barrel holddown prior to removal of shaft seal or
main shaft. Failure to follow this procedure may result in pump failure.
NOTE:
The four main assembly bolts (1, Figure 9) are torqued to 450 lbs-ft., 610,2
Nm. These bolts should be loosened pr ior to removing unit for disassembly.
Position pump unit so that the valve block assembly (11/12, Figure 10) is on top.
A bench or similar suitable surface capable of supporting unit should be used.
Disassembly area should be clean.
See figure 10.
Remove the eight hex. head cap screws (12) and lift the entire b lock
assembly from the port block.
See figure 13.
Remove the four hex. head cap screws (58) and four soc. hd. screws
(53) and lift the entire block assembly from the port block.
See figure 12.
Remove plugs (20), (23) and pin (21). Remove the 8-32 nut from the
bottom of block (1) to remove filter assembly (14). Do not remove the check valves (2).
Remove housing (8), o-ring (9), piston seal (10), o-r ing (11), screw (6), nut (7), and
acorn nut (45) as a unit.
Remove spring (12) and cone (13). Remove seat (5) and o-ring (4).
NOTE:
Seat is made for hex. wrenching. Use 1/2” six point socket with 1/4” drive.
Remove plug (25) and replenishing relief valve (36).
Remove o-rings (37), (48) and (47). Remove four screws (43) and remove the retainer
plate (42). Do not remove roll pins (46) unless replacements are needed.
Remove gasket (29) and seats (27) and (28). Remove poppets (30), (31) and spr ings
(32), (33), (35) and retainer (34).
Inspect orifices (3) visually to insure they are open. Do not remove unless damage or
clogging is apparent.
See figure 7.
Remove the four screws (13) with nyltite washers (12) from the side
cover (15) and remove the input control assembly.
NOTE:
The nyltite washers must be replaced at assembly.
Remove the four screws (13) with nyltite washers (12) from the side cover (14).
Remove the two screws (11) and spacers (10) and remo ve the balance plate (9).
See figure 6.
Remove the two screws (6) and remove the balance stem (7).
NOTE:
P24/30S units will require removing the shuttle valve assembly and external
vane pump assembly and tubing.
Removal of External Aux. Pump Shuttle Valve, Mounting Adapter and Internal
Aux. Pump
See figure 10.
Remove tubing between external pump and main pump.
Remove two screws holding pump. Remove pump from rear drive mounting pad.
Remove four screws holding shuttle (19) in place. Remove shuttle block.
Remove four screws (18) attaching shuttle adapter (17) and remo ve adapter and
o-rings (15) & (16).
Remove six screws (7) and mounting adapter (6), coupling (14), and gask et (22).
On non-rear drive units.
Remove plug (9) and o-ring (8).
Remove eight screws (7), and end cover (6), two tetraseals (5) and o-rings (4) and (3).
Remove auxiliary pump assembly (2).
INTRODUCTION
DISASSEMBLY
VALVE BLOCK
(after 7-93)
CONTROL COVERS
SERVO/REPLENISH PUMP
AND BARREL HOLDDOWN
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