Titan 449-700, Owner'S Manual

22

PowrTwin 5500™

Hydraulic Motor

Hydraulic Motor

Service Instructions

DISASSEMBLY

1. Disconnect the high pressure hose line from the Elbow (23) on
the back of the rotary pump. See Page 21 of the Hydraulic
System.
2. Remove the two mounting - bolts (12), and Lock Washers (11)
which attach the motor pump assembly to the frame. See Cart
Assembly, Page 20.
3. Place the motor pump assembly in a vise, holding it securely by
the Pump Block (25).

DISASSEMBLY OF HYDRAULIC MOTOR

Disassembly of the hydraulic motor must be carried out in an
absolutely clean area. Any dust or metallic particles left in the
motor or entering it on reassembly may damage the critical parts
and affect its service life and warranty. If the hydraulic motor is
operable, start the machine and place the Piston Rod (21) in its
top position.
1. Remove Cylinder Head Plug (7).
2. Loosen Lock Ring (22) with a spanner wrench and unthread
tube retaining nut on Tee (27). Lift Retaining Nut (27) up. Insert
Screwdriver flat tip into split on Retaining Collar (27). Twist slightly
to raise up approximately 1/2". Loosen Tube Retaining Nut on
Elbow (15). Slide nut down. Push Motor Tube (26) into Tee (27) far
enough to clear Elbow (15). Slowly unthread Head Assembly (11)
and Iift it just high enough above the Cylinder (23) to reach the
Valve Rod (20) with vise grip pliers.
3. The Piston Rod (21) should be near the top of its stroke for dis-
assembly. It may be necessary to use a wood or nylon driver to
push the piston rod up to its top position.
4. Grip the Valve Rod securely with vise grip pliers and then
remove the FlexLoc Nut (9) from the top of the Valve Rod
Assembly (20). Be careful that Spool (5) does not fall. The Head
(11) can now be lifted off. Unthread the Cylinder (23) from the
Motor Pump Block (25). Note: An extra Lock Ring (22) can be
used to jam the two Lock Rings (22) together on the cylinder and a
pipe wrench can now be used to unthread the Cylinder (23) from
the Pump Block (25).
5. To remove Connecting Rod Pin (2), slide the Ring up with a
small screwdriver. Then push the Connecting Rod Pin out. See the
illustration on Page 31.
6. Remove the Piston Rod Assembly from the Pump Block (25).
7. Remove Seal (24), being extremely careful not to scratch the
seal groove in the Motor Block (25).
8. Unthread Piston Retainer Screw (16) from Piston Rod (21) by
holding piston rod firmly at its base in a vise. Check screw for
damage.
9. Remove Piston (17) and lift out Valve Rod Assembly (20).
10. Remove Piston Seal (18) and O-Ring (19).
11. Remove Trip Retainers (1), Trip Springs (3), and Balls (4) from
Cylinder Head (11). Remove O-Rings (2) from Trip Retainers (1).
12. Remove Snap Ring (14) and Sleeve Retainer (13) and then
gently tap Spool and Sleeve Set (5) out of Cylinder Head (11).
Remove O-Rings (6) from valve sleeve.
13. Inspect Piston Rod (21) and Cylinder (23) for wear, scratches,
and dents. Replace if damaged.
14. Inspect Spool Valve (5) for wear. Replace if necessary. Spool
Valve should move smoothly and freely with no force by holding in
a vertical position. If it does not, it can cause the motor to stall.

Reassembly of this motor should be carried out in a clean,
dust free area only. It is recommended that a full Motor
Service kit, Minor be on hand. All parts should be inspected
for absolute cleanliness. Any particles of dust or metal will
affect service life of the sealed motor and hydraulic system.

TORQUE FLEX LOCKNUT
TO 10 FT-LB (146 N/m)
USE BLUE LOCTITE

USE BLUE
LOCTITE ON
LOCK RING

USE
HYDRAULIC
SEALANT
HERE

TORQUE HED PLUG TO15
FT-LB (219 N/m)
DO NOT OVERTIGHTEN 
O-RING SEAL

TORQUE TRIP
RETAINERS
TO15 FT-LB (365
N/m)
DO NOT
OVERTIGHTEN 
O-RING SEAL

TORQUE 
PISTON 
RETAINERS TO
75 FT-LB

(1095 N/m)

USE 
RED LOCTITE.

SEAL LIP MUST FACE UP

SEAL LIP MUST
FACE DOWN

NOTE: VALVE ROD ASSEMBLY
IS FACTORY SET AND PERMA-
NENTLY LOCTITED. DO NOT
DISASSEMBLE.