Motor Pump Block (25) with a gently pushing and rotating motion
to work the Piston Rod (21) in through the Seal (24).
9. Replace the Connecting Rod Pin and Retainer Ring. See illus-
tration below.
10. Install O-Ring (12) on cylinder wall. Lubricate ring and inner
wall. With Piston Rod held firmly, the cylinder should be gently dri-
ven over the piston seal with a rubber mallet. Tightly thread the
cylinder into Motor Pump Block (25).
11. Raise Piston Rod (21) to top position and thread Lock Ring
(22) all the way up on upper threads of Cylinder (23).
12. Pull Valve Rod Assembly (20) up as far as it will travel and
grasp it with vise grip pliers. Then install Cylinder Head (11),
already assembled, over valve rod until the top threads of the
valve rod pass through the top of the Spool (5). The valve rod
threads must be clean and free of oil. Place one drop of blue
Loctite on threads of Flex Lock Nut (9) and thread nut onto valve
rod to full tight position (do not overtighten) while holding valve rod
below with vise grip pliers.
13. Thread Cylinder Head (11) down onto the Cylinder (23) and
then back off just enough to reassemble hydraulic fittings and
Motor Tube (26). Tighten lock ring with spanner wrench to hold
cylinder head in position.
14. The Tee Assembly (27) and the Elbow (15) uses an O-Ring
(27a) to seal on the O.D. of the Motor Tube (26). For installation of
Elbow (15) see Page 32. The O.D. of the Motor Tube (26) should
be free of scratches or sharp edges. The lock nuts on these fit-
tings should be hand tightened, then wrench tightened another half
turn.
15. Install O-Ring (8) onto Cylinder Head Plug (7). Tighten.
235-050 MOTOR SERVICE KIT, MINOR
ITEM PART
NO. NO. DESCRIPTION QUANTITY
2 141-007 O-Ring 2
3 325-005 Spring, Trip 2
4 569-016 Ball, SS 2
6 441-152 O-Ring 3
8 441-217 O-Ring 1
9 858-811 Nut, Flex Lock 1
12 431-032 O-Ring 2
18 235-027 Seal, Piston 1
19 235-026 O-Ring 1
24 235-028 Seal, Rod 1
PowrTwin 4500™
Fluid Pump
CONNECTING PIN ARRANGEMENT
WET CUP
AREA FOR
PISTON LUBE
PACKING
LUBRICANT
LUBRICATE
O-RING
PTFE TAP
SYPHON HOSE
PEAK OF UPPER
PACKINGS MUST
FACE UP
PEAK OF LOWER
PACKINGS MUST
FACE DOWN
TORQUE
PISTON
RETAINERS TO
75 FT-LB
(1095 N/m)
USE
BLUE LOCTITE.
