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NOTES:
Clean and inspect all parts for wear or damage.
Replace parts as needed. For the best results,
always replace all the o-rings and seals when you
disassemble the pump. Repair kit 236–861 is
available. Parts included in the kit are marked with
an asterisk on the parts lists.
Assembly tool 189–305 is required for
reassembling the reciprocator. See Accessories to
order.
For Step 9 and 10, Loctite 242 thread sealant and
Loctite Primer T OR Perma-Loc 1 15 thread
sealant and Perma-Bond surface conditioner are
required. Be sure their shelf life is within the
manufacturer's recommendations.
1. Loosen both nuts on the inlet tube (57). Use a
wrench to rotate the tube fittings (16, 17) to the
side, and then remove the tube (57). Install plugs
in the fittings to prevent contamination. See the
Parts Drawing on page 20.
2. Remove the capscrew (14), nuts (7) and lock
washers (6) on top of the reciprocator. See Fig. 6.
105
103
12
24
Fig. 6
Reciprocator Repair
14, 33, 27
6, 7
47
56
3. Remove the four capscrews (24) and the retainer
housing (56). Tap the retainer housing with a
plastic mallet to loosen it and pull it off the bottom
cap (47). See Fig. 6. If needed, replace the throat
seals as described on page 11.
See Fig. 9 for Steps 4 to 13, except where noted.
4. Tap on the bottom of displacement rod (54) with a
plastic mallet to loosen the motor cylinder (39).
5. Grasp the valve spool (31) and pull it off the
cylinder and tie rods (49). Pull the cylinder and
piston off the bottom cap (47). It is not necessary
to remove the tie rods from the cap.
6. Lay the assembly on its side. Place a clean rag
around the yoke ( 43) to prevent losing the detent
balls. Slide the yoke (43) sideways off the valve
sleeve (32) while holding the balls (5) and spring
(20) in place.
7. Slide the cylinder (39) off the displacement rod
(54). Hold the hex end of the displacement rod in a
vise and use a spanner wrench in the pin holes of
the piston (35) to screw it off the rod.
CAUTION
Be careful not to scratch the outside of the dis-
placement rod.
8. Visually inspect the spring (36). If there is wear or
damage, proceed with this step. Remove the nut
(19), spring (36), and retainers (55) from the trip
rod (40). Reassemble with a retainer (55) on each
end of the new spring (36). Adjust the nut to obtain
the dimension shown in Fig. 7.
55
36
55
Fig. 7
40
1.580"
+/– 015"
19
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