Settling Forward Gear (A Gear) Backlash - TOHATSU MFS25 Service Manual

Lower Unit

32) Settling Forward Gear (A Gear) Backlash

Backlash Measuring Tool Kit :
P/N. 3C8-72234-0
Shaft 1 :
P/N. 345-72723-0
O-Ring 2 :
P/N. 332-60002-0
Collar 3 :
P/N. 346-72245-0
Plate 4 :
P/N. 3A3-72713-0
Conical Disc Spring 5 :
P/N. 3B7-72734-0
Clamp A 6 :
P/N. 3B7-72720-0
Clamp B 7 :
P/N. 3B7-72720-0
8 Pump Case (Lower)
9 Pinion Gear (B Gear)
1. Perform measurement of backlash between forward gear (A
gear) and pinion gear (B gear) with propeller shaft housing,
propeller shaft and reverse gear (C gear) removed from gear
case.
Put conical disk springs 5 on the groove side of shaft 1
getting their concave sides face to face, put O-ring 2 in the
groove, and then, collar 3. Then, screw plate 4 onto shaft
1 to midpoint. Put collar 3 side of shaft 1 into bearing of
forward gear (A gear) 0, and secure plate 4 with bolts.
Put two nuts (M10) w on the aft-end of shaft 1, and screw
the nuts onto the shaft with wrench. When drive shaft starts
to rotate as the nuts are turned, screw the nuts half of a turn
additionally. Keep shaft 1 in this state.
Secure clamp halves A 6 and B 7 using bolts. Turn drive
2.
shaft q a little to the right and left while pulling up in the
direction shown by arrow, use dial gauge to read indication
at the cut a.
Proper Backlash Obtained from Gauge Reading :
0.33 to 0.54 mm ( 0.0130 to 0.0213 in )
Sizes of Adjusting Shims :
For Pinion Gear (B Gear) Side : 0.1, 0.15, 0.3, 0.5mm
For Forward Gear (A Gear) Side : 0.1, 0.15mm
6-24
1
4
w
a
e
9
w
1
4
a
90˚
6
3
2
5
3
1 5
2
6&7
8
q
2
3
0
q
7
25/30 2006