1–6 Copyright © 2004 General Motors Corp.
1000 AND 2000 PRODUCT FAMILIES SERVICE MANUAL
5. Hydraulic System. A common hydraulic sys-
tem serves the torque converter and the trans-
mission. Transmission fluid for all hydraulic
operations, lubrication, and cooling comes
from the sump and is supplied by the charging
pump.
6. Transmission Fluid Filtration. Fluid filtration
is provided by two filter systems. A suction fil-
ter, located in the sump, provides general pro-
tection to the entire hydraulic system by
filtering large particulates. A spin-on filter pro-
vides full-time protection for the control sole-
noids and multipass protection for the entire
system. The spin-on filter is externally located
on the converter housing at the lower left front
of the transmission.
7. Electronic Controls
• A microcomputer provides electronically-
controlled automatic gear selection and
automatic engagement of the torque
converter clutch. The microcomputer is an
independent controller and is referred to as
a Transmission Control Module, or TCM.
• The electronic control system uses adaptive
logic to provide optimum shift quality.
Driving efficiency is improved by shifting
at the exact programmed transmission shift
point for every engine/transmission/vehicle
combination. The electronic controls can be
customized for four-speed or five-speed
operation to meet vocational requirements.
8. Remote Oil Cooler. Ports for remote-mount oil
cooler lines are located on the bottom surface
of the converter housing near the converter
housing/main housing splitline or on the right
side of the direct-mount converter housing.
Remote oil-to-water coolers require plumbing
for transmission fluid and engine-cooling
water. Remote oil-to-air coolers may also be
used and only transmission fluid lines need to
be provided. Heat is transferred from the
transmission fluid to either water or air
depending upon the cooler type used.
9. Oil Fill Tube/Dipstick Provisions. All 1000 and
2000 Product Families models have a fill tube/
dipstick provision on both sides of the
transmission. The fill tube and dipstick are
OEM-installed and adapted as specified by the
vehicle manufacturer. A plug is installed in the
unused location.
10. Parking Pawl/Parking Brake
• All 1000 models, 2200 models, 1000 Series™,
and 2400 Series™ transmissions have a
park pawl. The internal parking pawl is
engaged by selection of the P (Park)
position on the shift selector. The parking
pawl is not available on 2100 and 2500
models and 2000 Series™ models.
• Some 1000 and 2000 Product Families
models are available with an optional rear
cover that accommodates an OEM-installed
two-shoe, expanding-type drum brake. All
parking brake controls and linkages are OEM-
supplied.
11. Power Takeoff. 1000 and 2000 Product
Families transmissions, except Highway Series
and Pupil Transport/Shuttle Series, and all
1000/2000/2400 Series transmissions have a
provision to drive a power takeoff (PTO) unit
mounted on the left and/or right side of the
transmission housing. The optional PTO drive
gear is driven by the transmission torque
converter turbine, with speed and torque
reflecting engine input and the characteristics
of the torque converter. PTO units and
associated controls are provided by the vehicle
manufacturer and/or body builder.
12. Output Yokes/Flanges. A variety of output
yokes or flanges are available to meet vehicle
driveline requirements. Yokes or flanges are
OEM-installed and are adapted as specified by
the vehicle manufacturer.
WARNING!
Operation with excessive loads can cause trans-
mission damage and unexpected vehicle move-
ment. To help avoid injury, property damage,
and/or transmission damage, do not exceed
11 800 kg (26,000 lbs) GCW or the OEM vehicle
rating, whichever is less.
To Next Page
Loading...
Need help?
General
