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.
FAN NUT
WASHER
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.
SPRING 
TENSIONER
PULLEY ARM
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.
M48 Tank
5.10.Use a small
PULLER
PULLEY
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.
NUT
ROD END
BOLT
LOCK WASHER
CONTROL ARM
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.
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