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Displacement Pump Repair
Before you start:
1. A packing repair kit, part no. 206-927, is
available.
This kit includes two glands and
eight packings for the motor as well as o-rings,
packings and washers for the displacement
pump. For the best results, use all the parts in
the kit.
2. Clean all parts as you disassemble them, using
a compatible solvent, and inspect for wear or
damage. Replace parts as necessary.
Disassembly
1. Follow the Pressure Relief Procedure.
2. Remove nut (10) and priming plate (9) from
priming rod (8).
3. Unscrew the foot valve housing (7) from
cylinder (2).
NOTE:
Poppet check (6) foot valve
packings and bearings (5) slide off priming
rod (8) when removing foot valve housing.
4. Unscrew bearing (5) from foot valve (7).
5. Remove poppet check (6) and inspect foot
valve packings (30).
6. Unscrew riser tube (2) from pump base. Clean
the tube and inspect it for wear by hold it up to
a light at a slight angle. If you see wavy lines
or scratches where the piston travels, replace
the tube as it will not seal well with the new
piston packings and the pump will perform
poorly.
7. Loosen the locknut (4) and unscrew the valve
housing (14) from the connecting rod (3),
unscrew valve housing (14) form piston
housing (16).
8. Remove washers (17), spreaders (19), cup
packings (21), o-ring (27) and packing retainer
(20) form the piston housing (16).
9. Clean and inspect all the parts.
Reassembly
10. Reassemble the piston, using all the new parts
from the kit and any other new parts needed.
Oil the leather packings (21) first.
assemble the parts on the piston housing (16)
in this order: backup washer (17*), spreader
(19*), leather packing (21*), packing retainer
(20) with new o-ring (27*), installed in it,
another leather packing (21*), spreader (19*)
and back up washer (17*).
NOTE: To replace the throat packings, follow
the procedure given in your separate air motor
manual, 306-982, supplied, before continuing
with this procedure.
13
3
15
20, 27
5
11
30
Then
Figure 3
1
2
4
14
17
19, 21
16
6
7
8
9
10
11
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