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Repair
•
To service the pump assembly, see manual
311833.
•
To service the air motor, see manual 311238.
Before you start
•
Have all the necessary repair parts on hand. Rec-
ommended spare parts are shown in the parts list,
for example (1†).
•
A packing repair kit (207349) is available for the
lower. Use all the new parts in the kit for the best
results. Kit parts are indicated with an asterisk, for
example, (8*).
•
Always replace the glands when replacing the pack-
ings, whether or not you use a repair kit.
•
Use a compatible solvent to clean parts. Inspect
parts for wear or damage and replace parts as
needed. Scoring or irregular surfaces of the dis-
placement rod or polished inner wall of the cylinder
causes premature packing wear and leaking. check
these parts by rubbing a finger on the surface and
by holding the parts up to the light at a slight angle.
•
Use light, water-proof grease wherever lubrication is
indicated.
Disassembly
1. Flush the pump, if possible. Relieve the pressure,
see Pressure Relief Procedure on page 4.
2. Disconnect the hoses from the lower and plug the
ends to prevent fluid contamination.
3. Remove the pump from its mounting and place it in
a vise by clamping the intake valve housing (18).
4. Disconnect the lower from the motor as explained in
your separate pump manual.
5. Pull the pump away from the motor.
311716B
6. Remove the screws (5) from the packing retainer
(2). Remove the packing retainer.
7. Screw the tie bolts (4) out of the intake housing (18).
8. Pull the outlet housing (19) off the cylinder (17†).
9. Remove the bearing (8*), female gland (12*),
v-packings (22*), and male gland (11*) from the out-
let housing (19).
10. Remove the displacement rod (1†) from the cylinder
(17†). Remove the cylinder. Inspect the outer sur-
face of the displacement rod and the inner surface
of the cylinder for scoring or damage.
11. Remove the intake valve housing (18) from the vise,
remove the pin (6†), plate (16*), and o-ring (21*).
Inspect the seat (14) in place.
12. Place the displacement rod assembly in a vise,
holding it by the flats. Use a 2-1/2 in. hex wrench to
remove the valve seat (13). Remove the bearing
(9*), packing (10*), plate (15*), and o-ring (20*). If
the rod needs replacing, remove one cotter pin (3†)
and pull the stop pin (7) out.
13. Clean all parts thoroughly, replace worn or dam-
aged parts. Lubricate all parts before reassembling.
Reassembly
1. One at a time, install the following parts in the outlet
housing (19): the male gland (11*), five PTFE
v-packings (22*) installed so the lips of the v-pack-
ings face down in the throat, the female gland (12*),
and the bearing (8*). Maintain a 0.020-0.050 in.
(0.508-1.27 mm) gap in the bearing seam. Install
the packing retainer (2) and loosely install the
screws (5).
2. Place the displacement rod (1†) in a vise, holding it
by the flats.
a. Install the stop pin (7) into the displacement rod
(1†) and secure with the cotter pins (3†).
b. Place the packing (1†) and bearing (9*) on the
displacement rod.
c. Install the valve plate (15*) into the displace-
ment rod (1).
Repair
5
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