HEXA

GEAR BOX

REAR COVER SHIM SELECTION PROCEDURES

A. COUNTER SHAFT (SHIM SELECTION)

The control dimension to be maintained between

Counter shaft 3

gear rear face and housing face

rear half is 198 ± 0.1mm.

Calculate the shim value as illustrated below:



Let the distance “A” as measured in the step 2

be 200mm



Measure the rear cover depth along with the

gasket at counter shaft end. Consider this as “B”,

let this depth be 2.30 mm.



Calculate the difference between “A” & “B”. Let it

be “C”.

C= A – B

C= 200 – 2.30

C= 197.7 mm



To maintain the control dimension of 198± 0.1

mm the shim thickness is calculated as below:

Thickness of shim to be inserted = 198 – C

= 198 – 197.7

= 0.3 mm

B. MAIN SHAFT SHIM SELECTION

The control dimension to be maintained between

Main shaft 2

gear Shoulder face front and housing

face rear half is 197 ± 0.1 mm.

Calculate the shim value as illustrated below



Let the distance “E” as measured in the step 3

be 202mm



Measure the rear cover depth along with the

gasket at main shaft end. Consider this as “F”,

let this depth be5.50 mm.



Calculate the difference between “E” & “F”. Let it

be “G”.

G= E – F

G= 202 – 5.50

G= 196.5 mm



To maintain the control dimension of 197±

0.1mm the shim thickness is calculated as be-

low:

Thickness of shim to be inserted = 197 – G

= 197 – 196.5

= 0.50 mm