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S.25
TYPE RB -
FREEWHEELING
The Volvo Penta reduction-reverse gear, type
RB, has a bui It-in reduction gear, with reduct-
ion ratio 1 .91: 1. Engagement "Ahead" or "As-
tern" takes place by means of se If-adjusting cones
which are held in the engaged position partly
with the he Ip of the prope Iler thrust.
When engaging "Ahead", the output shaft is
moved with its cone so that it meshes with the
front cone.
When "Astern" is engaged, the
output shaft is moved backwards and meshes
with the inner cone which operates via an inter-
mediate gear. The direction of rotation of the
output shaft wi II therefore be reversed.
In the
neutral position the cone is held by the locking
plunger in such a potition that there is clearance
oetween the cone and the gear whee I.
Reduction-reverse gear with ratio 1 .9 : 1 has a
separate oil changer and is watercooled.
Fig. 1. RB type reduction-reverse
gear, ratio 1.9:1
1. Plug for oi I fi Iling
2. Oil dipstick
3. Plug for draining oil
4. Drain plug for cooling water
REPAIR INSTRUCTIONS - REMOVING
The repair instructions refer to Fig. 2 for ratio
1.9 :1.
1.
Disconnect the cooling water connections
(rqtio 1.9 :1).
Removethepropellershaft
and push it aft.
2.
Remove the bolts holding the reverse gear
to the engine and pull the reverse gear
carefu Ily aft, without breaking, so that it
is re leased from the engine.
3.
Remove the bo I t (1 2) and pu II off the coup-
ling flange (10). Also lift off the rubber
protector (18). The key (15) need not be
removed.
4.
Remove the reverse gear lever from the
control shaft (1). Then remove the cover
(2). Pullout the control shaft (1) and the
eccentric stud (9) (note the position of the
stud which has marked sides.
5.
Remove the bolts which secure the reverse
gear housing (32) to the casing (33). Part
the casi ng from the housi ng by means of
light blows with a mallet.
6.
Remove the bolts (22) and take out the
shaft (17) with the sleeve (20).
8.
Remove the bolts (23) and the washer (24).
P lace one of the bo I ts (23) in the center
ho Ie of the support beari ng (27) and pu II
off the gear wheel (30).
If the ball bear-
ing (29) is to be removed from the gear
wheel, remove the bolts (25) and the ring,
(26) after whic h the ba II bearing is press-
ed out.
9.
Lift out the cone (28).
10.
Remove the gear wheel (31) with bearing
(34) from the housing (33).
Forthe reduct-
ion-reverse gear with ratio 1.9 : 1
J
remov-
ing is made easier by tapping carefu Ily on
the bevelledside of the gear wheel (31),
11.
See Fig. 2.
Remove the bolts (38). The
flange (44) need not be removed from the
shaft. Press out the shaft (42) together with
the cover (43tandthe ball bearing. Pres-
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