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Hydrostatic Tandem Pump
Replacement
Note: Cleanliness is a key factor in a successful
repair of any hydrostatic system. Thoroughly
clean all exposed surfaces prior to any type of
maintenance. Cleaning all parts with a solvent
wash and air drying is usually adequate.
As with any precision equipment, all parts
must be kept free of foreign material and
chemicals. Protect all exposed sealing areas
and open cavities from damage and foreign
material.
Upon removal, all seals, o-rings, and gaskets
should be replaced. Lightly lubricate all seals,
o-rings and gaskets with clean petroleum jelly
prior to installation.
Hydrostatic Tandem Pump Removal
1. Park the machine on a level surface, disengage the
PTO, set the parking brake, turn the ignition off and
remove the key.
2. Raise the seat.
3. Remove the negative battery cable from the battery.
4. Remove the front engine shield (Fig. 237).
Fig 237
Z580/Z593/Z595 Diesel Service Manual
HYDRAULIC SYSTEM
5. Using a spring removal tool (Toro part no. 92-5771),
remove the pump idler arm spring (Fig. 238).
6. Remove the belt from the pump pulley (Fig. 239).
IMG_7862
Fig 238
PICT-3185
Fig 239
PICT-3187
4
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