23
REASSEMBLY OF HYDRAULIC MOTOR
1. Replace O-Rings (6) onto Sleeve (5) after lubricating these parts
with oil.
CAUTION: Do not use Piston Lube pump packing lubricant. It is a
solvent and will severely damage seals and O-Rings of the
hydraulic motor.
Gently push the Spool Sleeve Set (5) into Cylinder Head (11) using
a nylon driver and a rubber mallet until sleeve has reached its full
depth. Do not use any other type of tool that might leave particles
or residue.
2. Install O-Rings (2) on Trip Retainers (1). Install the Trip Retainer
Balls (4) followed by Springs (3) which, when installed, will hold the
Spool (5) in proper place for assembly.
3. Install Sleeve Retainer (13) followed by Snap Ring (14) in
Cylinder Head (11) which will hold valve sleeve in place. Install O-
Ring (12) in O-Ring groove of cylinder head.
4. Replace Lower Seal (24) in Motor Block (25). Be sure the open
portion of the seal is facing upward (V). This seal requires no spe-
cial tool.
5. Place Piston Rod (21) in vise. Inspect Valve Rod Assembly (20)
for any damage. Make sure the lock nut at the bottom of the Valve
Rod Assembly (20) is secure. DO NOT remove. Then place into
Piston Rod (21) as illustrated. Install O-Ring (19), lubricating it well
and replacing Piston (17) onto Piston Rod (21). Put one drop of
blue Loctite on the Piston Retainer Screw (16). Tighten piston
retainer screw until piston is locked into place. Check Valve Rod
Assembly (20) for normal spring action at this time.
6. Install Piston Seal (18) with lips facing downward. Carefully
install The Piston Seal (18). Expand the ring and stretch it suffi-
ciently for installation.
7. With Motor Pump Block (25) still in vise, install Lower Seal (24)
by pushing it towards its groove with a properly sized blunt rod.
Then complete installation with the fingers. No tool is necessary.
Do not twist the seal.
8. Prelubricate the piston and valve rod assembly with Coolflo™
Hydraulic Fluid, Part No. 430-361. Install Piston Rod (21) into
PowrTwin 4500™
Hydraulic Motor
ITEM PART
NO. NO. DESCRIPTION QUANTITY
1 235-018 Retainer, Trip 2
2 141-007 O-Ring 2
3 325-005 Spring, Trip 2
4 569-016 Ball, SS 2
5 441-908 Spool / Sleeve Set 1
6 441-152 O-Ring 3
7 235-030 Plug, Cylinder Head 1
8 441-217 O-Ring 1
9 858-811 Nut, Flex Lock 1
10 818-002 Elbow, Street, 90
O
1
11 235-112 Cylinder Head 1
12 431-032 O-Ring 2
13 431-053 Retainer, Sleeve 1
14 431-054 Ring, Retainer 1
15 192-000 Elbow 1
16 235-022 Screw, Piston Retainer 1
17 235-014 Piston 1
18 235-027 Seal, Piston 1
19 235-026 O-Ring 1
20 235-021 Valve Rod Assembly 1
21 235-948 Piston Rod 1
22 235-001 Ring, Lock 1
23 235-007 Cylinder 1
24 235-028 Seal, Rod 1
25 235-929 Motor Pump Block 1
26 235-023 Tube, Motor 1
27 197-031 Tee 1
27a 431-019 O-Ring 1
