Dismantling The Overdrive; Inspecting The Overdrive; Removing The Front Casing; Dismantling The Clutch Unit - Volvo 164, 1970 Service Manual

3. Unscrew the bo l, t s ho lding .f,he overdrive un it to
the int'ermedi' a rf"e f l ange. Pull the overdrive straight
out backwards until it goes free from the geor-
box ma inshaft.
DISMANTLING THE OVERDRIVE
M aximu m clea nlin ess mu st be observed w hen work-
in g with th e over driv, e unit. Before th e d isma ntli ng,
d ean th e ourf"s ide of th e unit thorou ghly. Then f irst
di sma nt ie , t he ma in parts as f oH ow s:
l .
Place th e overdrive ve'rtica'lIy in a v ice provided
with coppe'r jaws. Re movIe th e so leno'id and
ope'ratin g va lve.
2. Bend down t he locking tab, unscrew and remove
the nurf"s fior t he piston bridge pieces. Remove the
brid ge p ileces.
3. Unscrew the nuts ho lding the bra ke ring, front and
re ar cas in g. Loosen th e nuts success ive ly a ll round
in order to av,o id any d istortio n from t he sp rin gs.
Lif t off th e fro nrf " casin g and hra ke ring, see Fig.
4-47.
4. Ta p loose th e bra ke rin g f ro m the firo nt cas ing
with the ,help of a copper d rift and hamm er.
5. Remove t he springs for the clutch sli,ding member.
Lift ou, t the clu tch sliding member complete with
thrust bearing and sunwheel.
6. Lift out the planet gear cmrier complete.
REMOVING THE FRONT CASING
l.
P ,loce the casing with the front side downwards
on a bench. Connect compressed air to the hole
for the opelwting valve and blow out the pistons.
2. Disconnect the base plate and remove the pre-
filter. Then remove the plugs and take out the
parts for therespeotive fine filt' e r, relief valve and
pump check valve . See a:lso under the heading
"Work which oan be c::t rried out with the over-
drive installed".
Fig. 4·47. Dismantling the overdrive
VOLVO
10311 7
3. Pr.ess down and pull ou, t the pump cylinder. Then
take out the connecting rod and pump plunger.
DISMANTLING THE CLUTCH UNIT
l.
Remove the circlip for the sunwheel. PuH out the
sunwheel backwards.
2.
Remove the inner cilrclip for the bearing. Hold
the bearing body land tap loose , t he dutch slid ing
member with a rubber ma ll et.
3. Remove the outer oilrclip and press the bearing
out of the be,aring housing.
DISMANTLING THE REAR CASING
l. R ' e move the bolt and puH out · t he retainer, the
bush and the spe'edometer pinion.
2. Remove the nut and pUllioff the flange with
pu ll er SYO
2261.
Place the housing in a press
and press ou' t the ,output shaft.
3. Remove t he spacer, the speedometelr driving gear.
Pull o ut the belaring on the outpurf" s haft, suitab ly
with a so-caHed Imife extractor. The rear bearing
and o il sea l ·are pressed out of the housing with
drif t SY O 1797 and ha nd le SYO 1801.
4. Remove the cirdip and tfhe o il thrower, w hich
hold th e uni -d i,rectiona.1 clutoh o n t he ouf.put shaft.
Lift out the uni -dir,ectio nal cluk h compon en ts.
RemoYle the t hrust wa sher. If necessalry pull t he
bush on the output shaft ou, t wi th p uller SYO
2423, see Fig . 4-48.
INSPECTING THE OVERDRIVE
Before inspecting, dean all the parts In white spirit
a,nd then blow th em d ry with oompressed ai r. Pay
particular attention to th e cl eaning of the f iltelrs and
Fig. 4-48. Removin g th e bu sh, o utput sho ft
1.
Puller SYO 2423
4: 19