Service Manual

HYDRAULIC SYSTEM

4-39Z580/Z593/Z595 Diesel Service Manual

Hydraulic Oil Cooler Replacement

Hydraulic Oil Cooler Removal

Machines built prior to 2008: Under certain conditions

higher than desired case drain pressure or hydraulic

pressure “spikes” can force oil past the tandem pump

trunnion shaft seal. To correct this, there is an oil cooler

kit (115-3565). With trunnion shaft seals, a larger cap-

acity oil cooler and increased diameter (from 3/8” to 1/2”)

case drain hoses and ﬁ ttings. Refer to Z Master Zero

Radius Tractors Service Bulletin #93 Issued: March 7,

2008.

1. Park the machine on a level surface, disengage the

PTO, engage 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. Raise the hood assembly.

5. Remove the 3 bolts, washers and nuts securing right

side top frame brace. Remove the top brace (Fig.

366).

9. Install the negative battery cable from the battery.

10. Lower the seat.

8. Install the front engine panel (Fig. 365).

Fig 366 PICT-3421

Fig 365 IMG_7862