Volvo Penta AQUAMATIC 280 Workshop Manual page 59

Repair instructions
884387
885153
16 a. Drives with integrated bearings
From models SP-A1 and DP-A1 on
Brace the special tool 884387 plate and ring 885153
(tool kit 885152) in a vise and install the gear housing
in the tool.
16 b. Drives without integrated bearings
Up to models SP-A1 and DP-A1
Brace the special tool 884387 plate in a vise and
install the gear housing in the plate.
17. Install the preassembled double bearing box with
0.4 mm (0.0157") shims. Make sure not to squeeze
the shims in the O-ring groove. Tighten the 4 Allen-
head screws.
56
18. Use sufficient number of shims to create clear-
ance of max. 0.1 mm (0.004") between the top cover
and the upper gear housing as shown in the picture.
Install the cover and tighten the cover screws.
19. Install a dial indicator to measure backlash. The
correct backlash should be 0.15–0.25 mm (0.006–
0.010"). On 2.15 and 2.30 ratio drives (only model
290A) the backslash should be 0.08–0.18 mm (0.003–
0.007").
If the backlash is too tight, shims must be added be-
tween the double bearing box and the gear housing. If
the backlash is too loose, shims must be removed
from the double bearing box. A shim thickness of
0.10 mm (0.004") is a safe adjustment step.