Chevrolet CHEVY VAN G10 SERIES Service Manual page 249

7. Reinstall transmission support crossm ember to trans­
mission and frame.
8
. Remove transm ission lift equipm ent.
9. Connect propeller shaft to transm ission.
10. Connect m anual control lever rod and deten t cable to
transm ission.
11. Connect vacuum m odulator line, and speedom eter drive
cable to transm ission.
12. Refill transm ission through filler tu be, and following the
recom m ended procedure provided earlier in this section.
13. Check transm ission for proper operation and for leakage.
Check and, if necessary, adjust linkage.
14. Remove van from hoist.
PARK LOCK PAWL SHAFT
AND PLUG REPLACEMENT
Removal
1. Place van on hoist and remove oil pan drain plug to drain
oil.
A lthough certain operations, such as oil pan gasket or
manual levers and oil seal replacem ent, d eten t cable, governor,
0
filler pipe " " ring, speedom eter drive gear, case extension
" O " ring and rear oil and yoke seal, vacuum m odulator, and
interm ediate clutch accum ulator cover service may be p er­
form ed from undern eath the vehicle w ith out removing the
TURBO HYDRA-MATIC 350 DIAGNOSIS PROCEDURE
A ccurate diagnosis o f transm ission problem s begins w ith a
thorough understanding o f norm al transm ission operation. !n
particular, know ing w hich units are involved in the various
speeds or shifts so th at the specific units or circuits involved in
the problem can be isolated and investigated furth er. A na­
lytical diagnosis will p ro tect the technician from come backs
and certainly will improve ow ner satisfaction.
An im portant and often overlooked aspect o f diagnosis is
finding out specific custom er com plaints. For this purpose a
short ride w ith the custom er will often prove beneficial. It
may be found that the condition the custom er w ants corrected
is standard and should n ot be altered.
The following sequence, based on field experience, provides
the desired inform ation quickly and in m ost cases actually
corrects the m alfunction w ithou t requiring the removal o f the
transm ission. Details o f the items listed in this sequence are
covered further in the tex t.
SEQUENCE FOR TURBO H YDRA -M ATIC 350
DIAGNOSIS PROCEDURE
1. Check oil level and condition.
2. Check and correct d etent cable adjustm ent.
3. Check and correct vacuum line and fittings.
4. Check and correct m anual linkage.
OTHER SERVICE OPERATIONS
CLUTCHES & TRANSMISSIONS 7-13
2. Remove oil pan , governor cover, governor and all park
lock pawl attaching parts.
3. Slide pawl tow ards front o f case and cock on shaft.
4. Using a suitable drift rap sharply against the pawl until
plug is freed from case. Care m ust be taken so that the
pawl does not hit the cast post in case w hich holds the
pawl return spring.
5. Remove shaft.
Installation
1. Install parking pawl using a new shaft and plug. Coat plug
w ith a suitable sealer prior to installation and stake in
place.
2
. Install park lock pawl attaching parts, governor, cover,
and oil pan.
3. Replenish transm ission fluid and remove van from hoist.
T urbo Hydra-M atic 350; their service procedure is covered in
the Overhaul portion o f this Manual and is n o t repeated here.
Refer to the T urbo Hydra-M atic 350 Section o f the Overhaul
p o rtio n o f this Manual for all other service operations not
covered here.
O IL LEVEL AND C O NDITIO N CHECK
Always check the oil level before road testing. Oil m ust be
visible on dip stick prior to operating the vehicle. Erratic
shifting, pum p noise, or other m alfunctions can in some cases
be traced to im proper oil level.
Oil level should be checked w ith the selector lever in the
Park (P) position, engine running, and the vehicle on level
pavem ent.
Fluid level should be to the FULL m ark w ith the trans­
mission at norm al operating tem perature (1 7 0 "-190°F.). With
warm fluid (room tem p eratu re), the level should be at or
slightly below the ADD m ark.
If oil level was low , refer to Oil Leaks.
The condition o f th e oil is often an indication o f w hether
the transm ission should be removed from the vehicle, or to
make further tests. When checking oil level, a burned smell and
discoloration indicate burned clutches or band and the trans­
mission will have to be removed.
M ANUAL LINKAGE
M anual linkage adjustm ent and the associated neutral start
sw itch are im p ortan t from a safety standpoint. The neutral
start sw itch should be adjusted so th a t the engine will start in
th e Park and N eutral positions only.
C H E V Y V A N SH O P M A N U A L