CAUSES OF BURNT FLUID
Burn t, discolored fluid is a r esu lt of overhea tin g
which h as thr ee primar y cau ses.
1. In ternal clutch slippa ge, u su ally caused by low
lin e pressur e, in adequa te clutch a pply pressu re, or
clutch sea l failure.
2. A resu lt of restr icted fluid flow through th e
main a nd/or a uxiliary cooler. This condition is usu-
ally t he resu lt of a faulty or improper ly insta lled
dr ainback valve, a dama ged oil cooler, or severe
restrictions in the coolers an d lines caused by debris
or kin ked lines.
3. Heavy duty oper ation with a vehicle not pr op-
erly equipped for this t ype of operat ion. Trailer tow-
ing or similar h igh load opera tion will overheat the
transmission flu id if the veh icle is improper ly
equipped. Su ch vehicles shou ld h ave an auxiliar y
transmission flu id cooler, a heavy duty coolin g sys-
tem, an d the engine/axle ratio combina tion needed to
handle hea vy loads.
FLUID CONTAMINATION
Transmission fluid cont amination is generally a
result of:
• adding incorrect flu id
• failure to clean dipst ick and fill tu be wh en
checking level
• en gin e coolant enterin g the fluid
• interna l failur e that generat es debris
• overhea t th at generates sludge (fluid break-
down)
• failure to r eplace con taminated con verter a fter
repair
The use of non-recom mended fluids can result in
transmission failur e. The usua l results are err atic
sh ifts, slippage, abnor mal wear an d event ual failure
du e to flu id br eakdown and sludge for mation. Avoid
this condition by u sing recomm ended flu ids only.
The dipstick cap and fill tube shou ld be wiped
clean before checking flu id level. Dirt, grea se a nd
other foreign materia l on the ca p and tube could fall
into the t ube if not rem oved beforeh and. Take th e
time to wipe the ca p an d tu be clean before withdraw-
ing the dipstick.
Engine coolant in the transmission fluid is gener-
ally caused by a cooler ma lfunction. The only remedy
is t o r eplace the radiator as the cooler in the radiat or
is not a serviceable pa rt. If coolant has circu lated
through th e tra nsmission, an overha ul is necessa ry.
The torqu e convert er should be repla ced when ever
a fa ilu re genera tes sludge an d debris. This is neces-
sa ry because normal converter flu sh ing procedures
will not remove all contamin ants.
STAN DARD PROCEDU RE
CHECK OIL LEVEL
(1) Verify that the veh icle is par ked on a level su r-
face.
(2) Remove locking pin (1) (Fig. 149). Rem ove th e
plate of the l ocking pin with a suitable tool and press
out the pin rem ain ing in th e cap downwards.
(3) Remove cap (2).
WARNING: Risk of accident from vehicle starting off
by itself when engine running. Risk of injury from
contusions and burns if you insert your hands into
the engine when it is started or when it is running.
Secure vehicle to prevent it from moving off by
itself. Wear properly fastened and close-fitting work
clothes. Do not touch hot or rotating parts.
(4) Actuate th e service brake. St art en gin e and let
it run at idle speed in select or lever position “P ”.
(5) Sh ift thr ough the tran sm ission modes several
times wit h the veh icle stat ionary and the engine
id ling
(6) Warm up the tra nsmission, wa it a t least 2 min-
utes an d check the oil level with the engine ru nning.
Push th e Oil Dipst ick 8863A in up to t he st op on the
electrohydr aulic unit a nd pull out again, rea d off oil
level, repeat if n ecessary.
NOTE: The dipstick will protrude from the fill tube
approximately 75mm (3 inches) when installed.
Fig. 149 Remove Dipstick Tube Cap Lock
1 - LOCKING PIN
2 - TUBE CAP
3 - DIPSTICK TUBE
21 - 132 AUTOMATIC TRANSMISSION NAG1 - SERVICE INFORMATION VA
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