Chevrolet 1977 light duty truck, Руководство по обслуживанию

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C O O L —
(65°-85° F.)
(18°-29°C.)
L J L_J
r ^ i
r i
■ H O T
(1 9 0 -2 0 0 F.)
(88°-93° C.)
W A R M
NOTE: DO NOT OVERFILL. IT TAKES
ONLY ONE PINT TO RAISE
LEVEL FROM ADD TO FU LL
WITH A HOT TRANSMISSION.
Fig. 7A 2C D ipstick M arkings
from the A D D mark to the F U L L m ark requires one
pint o f fluid. Fluid level should be checked at every
engine oil change.
Fluid level should be to the F U L L mark with the
transm ission fluid at norm al operatin g tem perature (180°
F). W ith w arm fluid (room tem perature 70 F), the level
will be 3 /8 inch below the A D D mark on the dipstick.
The n o rm a l o p e ra tin g tem p eratu re is obtained only after
at least 15 miles o f highway type driving or the
equivalent o f city driving.
A pproxim ately 9 pints o f fluid are required to refill
transm ission after oil pan has been drained. The fluid
capacity o f the TH M 400 transmission and converter
assembly is approxim ately 22 pin ts but correct level is
d eterm in ed by m ark on the dipstick rath er than by
a m o u n t added. Use only D E X R O N * or DEXRONC? II
autom atic transm ission fluid or its equivalent.
N O T E : An early stage to a d ark er color from the
usual red color a n d / o r a strong odor that is usually
associated with overheated transmission fluid is
norm al, and is not a positive sign o f required
m ain te n a n c e or transmission failure.
C h e c k in g P ro c e d u re and A d d in g Fluid
To determ in e pro p er fluid level at norm al operating
tem p eratu re (180 T 7). proceed as follows:
1. Position vehicle on a level surface, place selector
lever in park (P), apply park in g brake and have engine
ru n n in g at n o rm a l idle.
2. Rem ove fluid level indicator, wipe it clean and
reinstall fully until cap seats.
3. Remove indicator and reading o f fluid level
should be at full “ F ” mark.
4.
If additional fluid is required, add
D E X R O N -
or D E X R O N * II autom atic transmission fluid or its
equivalent to “ F ” m ark on indicator.
If the vehicle can n o t be driven sufficiently to bring
the transm ission to o perating tem perature and it
becom es necessary to check the fluid level, the
transm ission may be checked at room tem perature (70
degrees F) as follows:
1. Position selector lever in park (P), apply parking
brake and start engine. DO N O T RACE E N G IN E .
Move selector lever through each range.
2. Immediately check fluid level with selector lever
in Park, engine running and vehicle on LEVEL surface.
Fluid level on in dicator should be 3 /8 inch below
the " A D D " mark.
3.
If additional fluid is required, add enough fluid
to bring level to 3 /8 inch below the A D D m ark on the
dipstick. If transmission fluid level is correctly estab­
lished at 70 F, it will ap p e a r at the F U L L m ark on the
dipstick when the transmission reaches its norm al
operating tem perature o f 180°F.
C A U T IO N :
D O N O T O V E R F I L L
,
as foaming
and loss o f fluid through the vent pipe might
occur as fluid heats up.
If fluid is too low. especially when cold, complete
loss of drive m a y result which can cause transm is­
sion failure.
D ra in in g an d R e fillin g T ra n s m is s io n
The oil pan should be drained and filter replaced
and fresh fluid added to obtain the pro p er level on
indicator, at the intervals detailed in section O-B of this
manual. For vehicles subjected to heavy city traffic
during hot weather, or in commercial use, when the
engine is regularly idled for prolonged periods or when
vehicle is used for towing, oil pan should be drained and
filter replaced more frequently. See section O-B.
D rain fluid im m ediately after operation before it
has had an opportunity to cool.
W A R N IN G : T ra n s m is s io n fluid te m p e ra tu re
can exceed 3 5 0 F.
1. Raise vehicle and support transmission w'ith
suitable jack at transmission.
2. With fluid receptacle placed und er transmission
oil pan. remove oil pan attaching bolts from front and
side o f pan.
3. Loosen rear p a n attaching bolts approximately
four (4) turns.
4. Carefully pry transmission oil pan loose with
screwdriver, allowing fluid to drain.
5. Remove re m a in in g screws and remove oil pan
and gasket. Discard gasket.
6. D rain fluid from oil pan. Clean pan with solvent
and dry thoroughly with clean compressed air.
7. Remove oil filter re ta in e r bolt, oil filter
assembly, O-ring seal from intake pipe and discard the
filter and O-ring seal.
8. Install new O-ring seal on intake pipe and
install new filter on pipe assembly.
9. With O-ring seal on intak pipe, install pipe and
filter assembly, attaching filter to the control valve
assembly with its retain er bolt, torquing to 10 pound
feet.