Operation and maintenance manual

Section 210-0010
COOLING SYSTEM - Cooling Fan and Motor
SM 2116 1-02
2
triple pump is returned to tank, reducing oil flow
through fan motor (3) therefore decreasing fan speed.
The hydraulic fan drive system has a failsafe feature,
ie. if the electrical signal to the low temperature
unloader valve fails, the valve will close causing
maximum oil flow through fan motor (3), driving fan (2)
at maximum speed.
REMOVAL
Numbers in parentheses refer to Fig. 1.
WARNING
To prevent personal injury and property
damage, make sure blocking or lifting
equipment is properly secured and of
adequate capacity to do the job safely.
1. Position the machine on a level floor. Switch off the
engine and operate the steering several times to
discharge the steering system.
2. Block all road wheels and place the battery master
switch in the off position.
3. Remove mounting hardware securing hood
assembly to the machine and, using suitable lifting
equipment, remove hood assembly as described in
Section 100-0040, HOOD.
4. Remove radiator assembly from machine as
described in Section 210-0040, RADIATOR AND
MOUNTING.
5. Support radiator assembly with suitable lifting
equipment. Remove fan guard (6) and motor carrier
frame (5) from radiator assembly.
6. Remove two bolts, nuts and washers securing fan
(2) and motor (3) assembly to the motor carrier frame
(5). Remove fan (2) and motor (3) assembly from
motor carrier frame (5).
7. Remove six bolts (7) and lockwashers (8) securing
fan (2) to fan hub adaptor (4) on motor (3). Remove
fan (2) from fan hub adaptor (4).
8. Remove split pin (9), slotted nut (10) and washer
(11) from motor (3) shaft. Remove fan hub adaptor (4)
from motor (3).
MOTOR OVERHAUL
Numbers in parentheses refer to Fig. 2.
Internal parts of the motor are lubricated by the
operating fluid itself; therefore, preventive
maintenance is limited to keeping the fluid in the
system clean. Dirt should not be allowed to
accumulate on the motor or around the shaft seal.
Check frequently that all fittings and bolts are tight.
DISASSEMBLY
1. Drain all fluid from the motor, and clean the
external surface. Prepare a clean, lint free surface on
which to place the internal parts for inspection and
repair.
2. Remove the four housing screws (20) and carefully
remove the end cap (1).
3. By using two 10-24 UNC-2B screws, remove the
cartridge assembly (2-6) from the housing (9), giving it
small oscillations around its axis. Be careful the
cartridge assembly (2-6) does not explode: the rotor
(2) and the cam ring (6) must be removed from the
housing (9) at the same time.
4. With the same screws, remove the pressure plate
(7).
Note: The cartridge assembly (2-6) and the pressure
plate (7) may come out together if they are stuck by
oil.
ASSEMBLY
Note: Tighten all fasteners without special torques
specified, to standard torques listed in
Section 300-0080, STANDARD BOLT AND NUT
TORQUE SPECIFICATIONS.
WARNING
To prevent personal injury and property
damage, make sure blocking or lifting
equipment is properly secured and of
adequate capacity to do the job safely.
1. Use clean hydraulic fluid to lubricate all the internal
parts, including seals.
2. Install seal (16) on the pressure plate (7) spigot.
Install seal (8) in the housing (9).
3. By using two 10-24 UNC-2B screws, install the
pressure plate (7) inside the housing (9) and make
sure it is completely inserted and seated on its two
seals.