Dodge Ram Truck 1500-2500-3500. Manual — part 1785
6. Install new o-ring (11) on pump body. Lubricate oil seal and o-ring with petroleum jelly.
7. Install new pump seal (3) with Installer Tool
C-3860-A (1). Use hammer or mallet to tap seal
into place.
BEARING-OUTPUT SHAFT FRONT
REMOVAL
1. Remove overdrive unit from the vehicle.
2. Remove overdrive geartrain (5) from housing.
3. Remove snap-ring (2) holding output shaft front
bearing (1) to overdrive geartrain (5).
4. Pull bearing (1) from output shaft (3).
INSTALLATION
1. Place replacement bearing (1) in position on
geartrain (5) with locating retainer groove toward
the rear.
2. Push bearing (1) onto output shaft (3) until the
snap-ring groove is visible.
3. Install snap-ring (2) to hold bearing onto output
shaft (3).
4. Install overdrive geartrain (5) into housing.
5. Install overdrive unit in vehicle.
21 - 1072
AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION
DR/DH
BEARING-OUTPUT SHAFT REAR
REMOVAL
1. Remove overdrive unit from the vehicle. (Refer to
21 - TRANSMISSION/AUTOMATIC/OVERDRIVE -
REMOVAL)
2. Remove overdrive geartrain from housing.
3. Remove snap-ring (3) holding output shaft rear
bearing (1) into overdrive housing (2).
4. Using a suitable driver inserted through the rear
end of housing, drive bearing from housing.
INSTALLATION
1. Place replacement bearing (1) in position in hous-
ing (2).
2. Using a suitable driver, drive bearing (1) into hous-
ing (2) until the snap-ring groove is visible.
3. Install snap-ring (3) to hold bearing into housing.
4. Install overdrive geartrain into housing.
5. Install overdrive unit in vehicle.
DR/DH
AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION
21 - 1073
CLUTCH-OVERDRIVE
DESCRIPTION
The overdrive clutch is composed of the pressure plate (2), clutch plates, holding discs, overdrive piston retainer,
piston, piston spacer, and snap-rings. The overdrive clutch is the forwardmost component in the transmission over-
drive unit and is considered a holding component. The overdrive piston retainer, piston, and piston spacer are
located on the rear of the main transmission case.
NOTE: The number of discs and plates may vary with each engine and vehicle combination.
OPERATION
To apply the clutch, pressure is applied between the piston retainer and piston. The fluid pressure is provided by the
oil pump, transferred through the control valves and passageways, and enters the clutch through passages at the
lower rear portion of the valve body area. With pressure applied between the piston retainer and piston, the piston
moves away from the piston retainer and compresses the clutch pack. This action applies the clutch pack, allowing
torque to flow through the intermediate shaft into the overdrive planetary gear set. The overdrive clutch discs are
attached to the overdrive clutch hub while the overdrive clutch plates, reaction plate, and pressure plate are lugged
to the overdrive housing. This allows the intermediate shaft to transfer the engine torque to the planetary gear and
overrunning clutch. This drives the planetary gear inside the annulus, which is attached to the overdrive clutch drum
and output shaft, creating the desired gear ratio. The waved snap-ring is used to cushion the application of the
clutch pack for the 5 disc version of the overdrive clutch. The 6 disc overdrive clutch does not use a waved
snap-ring.
Overdrive Clutch
1 - REACTION PLATE
2 - PRESSURE PLATE
21 - 1074
AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION
DR/DH
UNIT-OVERDRIVE
REMOVAL
1. Shift transmission into PARK.
2. Raise vehicle.
3. Remove transfer case, if equipped.
4. Mark propeller shaft universal joint(s) and axle pinion yoke, or the companion flange and flange yoke, for align-
ment reference at installation, if necessary.
5. Disconnect and remove the rear propeller shaft, if necessary. (Refer to 3 - DIFFERENTIAL & DRIVELINE/PRO-
PELLER SHAFT/PROPELLER SHAFT - REMOVAL)
6. Remove transmission oil pan, remove gasket, drain oil and reinstall pan.
7. If overdrive unit had malfunctioned, or if fluid is contaminated, remove entire transmission. If diagnosis indicated
overdrive problems only, remove just the overdrive unit.
8. Support transmission with transmission jack.
9. Remove bolts (2) attaching overdrive unit (1) to
transmission.
CAUTION: Support the overdrive unit with a jack
before moving it rearward. This is necessary to
prevent damaging the intermediate shaft. Do not
allow the shaft to support the entire weight of the
overdrive unit.
10. Carefully work overdrive unit off intermediate
shaft. Do not tilt unit during removal. Keep it as
level as possible.
11. If overdrive unit does not require service, immedi-
ately insert Alignment Tool 6227-2 in splines of
planetary gear and overrunning clutch to prevent
splines from rotating out of alignment. If misalign-
ment occurs, overdrive unit will have to be disas-
sembled in order to realign splines.
12. Remove and retain overdrive piston thrust bearing. Bearing may remain on piston or in clutch hub during
removal.
13. Position drain pan on workbench.
14. Place overdrive unit over drain pan. Tilt unit to drain residual fluid from case.
15. Examine fluid for clutch material or metal fragments. If fluid contains these items, overhaul will be necessary.
16. If overdrive unit does not require any service, leave alignment tool in position. Tool will prevent accidental mis-
alignment of planetary gear and overrunning clutch splines.
DR/DH
AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION
21 - 1075
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст