ZF Repair Manual: ZF25A, ZF25, ZF45A, ZF45-1

3.7 TAPERED ROLLER BEARINGS

Check for failed bearings or excessive bearing wear.

3.7.1 Outer races of tapered roller bearing

Remove the outer races out of the housing halves by

means of the special tool (Fig. 7-1) or by heating the

housing halves in an oven to approx. 120 ëC (248 ëF):

Put the housing in the oven upside down, so the outer

races will fall down.

WARNING

Use protective gloves when handling the heated

housing and outer races.

IMPORTANT

Regard location of shims under each outer race for

correct position during reassembling.

Shims are located under outer races of the cover

only.

3.7.2 Inner races of tapered roller bearings

NOTE

input shaft - both sides

The extractor (Fig. 7-2a) is required for pulling

the inner races off.

For extracting the inner races proceed as follows:

Screw in adapter onto the puller (item 1).

Place adapter onto the roller cage.

Tighten collar to rollers by means of cap nut (item

2).

Screw spindle (item 3)against shaft and pull bear-

ing evenly and carefully off.

WARNING

Improper use of the extractor when removing the

races, could cause damage to the race or slip off.

ALTERNATIVELY

Input shaft - Control block side

The inner race and the gear on the control block side

can be removed by using the split ring and a standard

hydraulic press (fig. 7-2b).

Repair Manual and Spare Parts List

Section 3

FIG. 7 - 1

INPUT SPLINE SIDE

CONTROL BLOCK SIDE

FIG. 7 - 2a

CONTROL BLOCK SIDE

FIG. 7 - 2b