User Manual

• O-ring (new)
Fill Location
Oil Fill Location
1. Remove transmission oil fill plug at
Oil Fill Location.
2. Using a funnel, add a small amount
of fluid at fill location.
NOTE
DO NOT add fluid into dipstick hous-
ing.
3. Find the red-handled transmission-
fluid dipstick, located drivers-side,
outward of the engine.
4. Twist and remove dipstick, and
wipe clean using a towel or cloth.
5. Continue to fill, and then check,
until fluid level on dipstick indicates
FULL.
NOTE
DO NOT fill past the FULL line.
6. Apply oil to new O-ring and replace
O-ring at fill location.
7. Clean, then replace plug at fill
location, tightening plug to 44.3 lb∙ft
(60 N∙m).
Dispose of cloth/towel and old O-ring
properly.
How to Drain the
Transmission
Draining lubricating fluid from the
transmission should only be performed
during fluid replacement or a repair. Take
your vehicle to a PACCAR Powertrain
distributor for maintenance processes that
require draining transmission lubricant.
See TX-8 Transmission Lubricant
Capacities on page 40 and Lubricant
Specifications on page 40 for more
information on the amount and type of
lubricant required for this transmission.
LOW Mode Operation
The vehicle must be in Drive (
D) to activate
LOW Mode.
1. Push and hold the gear-shift lever
away until "L" appears on the
Transmission Gear Display.
The vehicle will remain in LOW Mode until
the operator either
• Presses the Manual Mode Button
(see Manual and Automatic Mode
on page 19)
• Pushes the gear-shift lever away
until "L" is removed from the
Transmission Gear Display (see
Upshifting and Downshifting on
page 18)
• Shifts into Neutral (N) and then into
Drive (D)
Manually Releasing the
Parking Pawl
Releasing the parking pawl manually, at
the transmission, requires use of the
Manual Release Lever. This procedure
should not be performed without this lever.
• Manual Release Lever (only
available as a service part)
OPERATION - How to Drain the Transmission
24 Y53-1331 (6/21)
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