23
SEE FIG. 13
1. Disconnect Fluid Pump as per page 21.
2. Place piston in block (PN 331-195) with the 3/8"
dowel pin (PN 331-196) and hold in vise.
NOTE: DO NOT use smaller diameter pin to hold
piston.
3. Place a 7/16" allen wrench into lower piston and
unscrew lower piston from upper piston. Clean all
parts and inspect them carefully for wear and
damage. Inspect the surface of piston for wear or
damage. Replace these parts if needed.
FIGURE 14 PARTS LIST
FIGURE 14
ITEM PART DESCRIPTION
NO.
NO.
331-011
331-029
331-030
331-032T
331-033A
331-292
1
2
3
4
5a
5b
2
3
4
1
FIGURE 13
Piston Ass'y
Ball
Seat
O-Ring-Teflon
1
2
3
4
331-093
331-027
331-026
331-100
1
2
5a
3
4
1. Unthread suction nut (Fig. 21, Item 2)
and remove suction assembly from
pump body.
2. Remove suction seat assembly,
O-ring, ball and retainer.
3. Clean all parts and inspect them
for wear or damage, replacing parts
as needed.
4. If lower seat need replacing, you must
replace the suction seat assembly.
(PN 331-033A Lo-Boy, PN 331-292 Hi-Boy)
5. Clean inside of pump body.
6. If no further pump service is needed,
reassemble the lower check valve assem-
bly, by placing the suction seat assembly,
O-ring, ball and retainer in the suction nut
and screw nut onto pump body. Tighten
suction nut with rod tool (189-211).
5b
Pump Body
Retainer
Ball 1/2" Dia.
O-Ring - Teflon
Suction Seat Ass'y (Lo-Boy)
Suction Seat Ass'y (Hi-Boy)
FIGURE 13 PARTS LIST
ITEM NO. PART NO. DESCRIPTION
4. To reassemble the piston assembly, place in block
using dowel pin and hold in vise. Install O-ring (4),
Seat (3) and Ball (2) and thread upper and lower
pistons together. Slowly hand tighten piston then
loosen piston and inspect that the O-ring (4) and
seat (3) , are flush, then torque to 50 fts. Do not
use locktite on threads, but apply light coat of
grease or anti-seize compound to threads.
SERVICING LOWER SUCTION VALVE
SERVICING PISTON ROD, UPPER CHECK VALVE
NOTE: The upper and lower piston must be purchased as an
assembly (Item 1, Fig 13). This assembly will not have the ball,
seat and O-ring inside.
