Repair
308390N
13
side, and then remove the tube (57). Install plugs in
the fittings to prevent contamination. See the Parts
Drawing on page 18.
2. Remove the capscrew (14), nuts (7), and lockwash-
ers (6) on the top of the reciprocator. (F
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).
(F
. 6) If needed, replace the throat seals as
described on page 11.
Refer to F
. 8 for Steps 4-13, 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 bottom 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.
NOTE:
Be careful not to scratch the outside of the dis-
placement rod or the inside of the cylinder.
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). Thread the nut onto the rod
until it runs out of thread so that it bottoms out on
the shoulder of the rod. (F
NOTE:
•
If any of these parts are being reused, use a
surface cleaner such as chlorinated solvent on
the threads and blow with compressed air. A
1/4-28 UNF-2A tap can be used to remove
adhesive from the internal threads of the yoke
(43).
•
Thread sealant and primer are required. For
step 9 and 10, Loctite 242
®
thread sealant and
Loctite
®
Primer T or Perma-Loc
®
115 thread
sealant and Perma-Bond
®
surface conditioner
are required. Be sure their shelf life is within the
manufacturer’s recommendations.
9. Apply fresh thread sealant to the first two or three
internal threads of the yoke (43). Apply primer to the
external threads of the rod (40). Let dry for three or
four minutes. Assemble and torque the rod to
96-100 in-lb (10.8-11.2 N.m). Remove excess seal-
ant. Allow 24 hours for the primer to cure before you
operate the reciprocator.
F
IG
. 6
6, 7
47
14, 33, 27
56
24
12
105
103
F
IG
. 7
55
36
19
55
40
