Servicing The Hydraulic Motor - Titan POWRTWIN 4900 PLUS Mode D'emploi

Maintenance
6.8 Servicing the Hydraulic Motor (Fig. 22)
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9
10
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19
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Perform this procedure using the necessary parts from Motor Service
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Kit — Minor (P/N 235-050). If the hydraulic motor is operable, start
22 the machine and jog the piston rod (19) into its top position.
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Disassembling the Hydraulic Motor
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24
(A)
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(B)
28
29
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30
31
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Refer to the "SAE O-Ring Fitting Installation"
procedure at the end of this section for installation
instructions for item 22 and 24.
Servicing of the hydraulic motor should be carried
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out in a clean, dust free area only. 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. All parts should be
inspected for absolute cleanliness.
1. Disconnect the pressure hose assembly (B) from the elbow on
the back of the hydraulic pump.
2. Remove the two mounting screws and two lock washers that
attach the motor/pump assembly to the cart.
3. Place the motor/pump assembly in a vise, holding it securely
by the motor/pump block (31).
4. Remove cylinder head plug (1).
5. Loosen lock ring (28) with a spanner wrench and unthread
tube retaining nut on tee (24). Loosen tube retaining nut
on elbow (22). Slide the nut down. Remove motor tube
assembly (23). Slowly unthread cylinder head (8) and Iift it just
high enough above the cylinder (29) to reach the valve rod
assembly (18) with vise grip pliers.
6. The piston rod (19) should be near the top of its stroke for
disassembly. It may be necessary to use a wood or nylon driver
to push the piston rod up to its top position.
7. Grip the valve rod securely with vise grip pliers and then
remove the FlexLoc nut (3) from the top of the valve rod
assembly (18). Be careful that spool (10) does not fall. The
cylinder head (8) can now be lifted off. Unthread the cylinder
(29) from the motor/pump block (31).
An extra lock ring (28) can be used to jam the two
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lock rings together on the cylinder and a pipe
wrench can be used to unthread the cylinder (29)
from the motor/pump block.
8. To remove the connecting pin (Fig. 23, 1), slide the retaining
ring (2) down with a small screwdriver, and then push the
connecting pin out.
9. Remove the piston rod assembly from the motor/pump block
(31).
10. Remove rod seal (30), being extremely careful not to scratch
the seal groove in the motor/pump block (31).
11. Place the piston retainer screw (14) on the piston rod assembly
in a vise. Slide a long bar through the hole at the base of the
piston rod for leverage, and unthread the piston rod from the
piston retainer screw.
12. Remove piston (19) and lift out valve rod assembly (18).
13. Remove piston seal (16) and o-ring (17).
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