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M48 Tank
7
5.6. Remove the nut, washer, and cooling fan from
the hydro pump to be replaced, using a 9/16”
wrench. See Figure 5.6.
5.7. Use a 3/8” breaker bar to move the belt ten-
sioner pulley arm, slipping the belt off of the pul-
ley. See Figure 5.7.
5.8. Unhook the spring that maintains tension on the
arm. This will provide more freedom of move-
ment.
5.9. Slip the belt over the drive pulley of the hydro
pump to be removed.
FAN
NUT
WASHER
Figure 5.6
Figure 5.7
TENSIONER
PULLEY ARM
SPRING
5.10. Use a small two-jaw puller to remove the pulley
from the tapered and keyed input shaft of the
hydro pump. See Figure 5.10.
5.11. Disconnect the rod end on the back of the hydro
control rod from the control arm on the hydro
pump using a 9/16” wrench, and a 1/2” wrench.
See Figure 5.11.
NOTE: There is a lock washer positioned
between the rod end and the control arm.
5.12. Thoroughly clean the area surrounding any
hydraulic fittings to be loosened or removed.
5.13. If the unit has been run recently, allow it to cool
before doing loosening any hydraulic fittings.
WARNING: Hot hydraulic fluid can cause seri-
ous burns.
WARNING: Release of pressurized hydraulic
fluid can cause serious of fatal injury.
Figure 5.10
PULLER
PULLEY
Figure 5.11
ROD END
BOLT
LOCK WASHER
NUT
CONTROL ARM