CHANGE OF OUTPUT SHAFTS
S40 - S70
Combination Right Angle (Helical-Worm) Reducer
The following are instructions for changing an output
shaft on S40-S70 helical worm gear reducers from B3A
to B3B mounting or from B3B to B3A.
Remove oil drain plug and drain oil.
Remove 6 lid bolts #24 and lid #21.
Remove oil seal #7 and bearing cap #26.
These items will be destroyed when removed.
Be careful not to damage the shaft. Scratches
on the seal surface causes oil leaks.
Remove snapring #13 from both ends of the
Turn the gearbox on its side so the output shaft
is pointing downwards.
Support the bronze gear with blocks between
the steel hub of the bronze gear and the gear
housing. This is to make sure the bronze gear
will not move from its position from the center of
the worm. Not blocking the gear can result in
breaking the gear housing.
Press out the shaft.
The shaft and the lower bearing will now come
out. Remove the bronze wormwheel.
Take the top bearing out, install the bearing on
the opposite side and secure the bearing with
snapring #13. Make sure the shims are installed
in front of the snapring (same as before).
Turn the bronze gear around 180°.
Press the shaft and bearing "in" from the top
side of the gearbox. When the shaft is pressed
"in" we have to make sure that the bronze gear
is centered properly. Centering can be
accomplished by shimming the shaft. Use the
existing shims #14 to center the gear. A bronze
gear is properly centered when the worm and
wormgear can be rotated relatively easy.
Install snapring #13.
Install new oil seal #7 and bearing cap #26.
Install lid #21 and 6 bolts #24.
Install drain plug.
Fill gear unit with 140W oil and install breather
NOTE: Item #7 and item #26 must be replaced
because they will be damaged at disassembly!