Chevrolet 10 series 1973, Overhaul Manual

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7M-14 CLUTCHES AND MANUAL TRANSMISSIONS
THREE-SPEED MUNCIE TRANSM ISSION
INDEX
Disassembly of Transmission .................................... 7M-14
Disassembly of Mainshaft............................................ 7M-14
Cleaning and Inspection............................................... 7M-14
Transmission Case........................................................ 7M-14
Front and Rear Bearing............................................. 7M-14
Bearing Rollers............................................................... 7M-14
Gears................................................................................. 7M-16
Reverse Idler Gear Bushing..................................... 7M-16
DISASSEMBLY OF TR ANSM ISSIO N (Fig. 1G)
1. Remove side cover attaching bolts, side cover
assembly, gasket and shift forks.
2. Remove drive gear bearing retainer bolts, retainer
and gasket.
3. Remove drive gear bearing to gear stem snap ring,
then remove drive gear bearing by pulling outward
on drive gear until a screw driver or other suitable
tool can be inserted between bearing, large snap
ring and case to complete removal. The drive gear
bearing is a slip fit on the gear and into the case
bore. (This provides clearance for removal of drive
gear and mainshaft assembly.)
4. Remove extension to case attaching bolts.
5. Rotate extension to left until groove in extension
housing flange lines up with the reverse idler shaft.
Using a drift or other suitable tool, drive reverse
idler shaft out of gear and case (fig. 2G).
6. Remove drive gear, mainshaft and extension
assembly together through case rear opening.
Remove reverse idler gear from case.
7. Remove drive gear from mainshaft.
8. Using snap ring pliers, expand the snap ring in the
extension which retains the mainshaft rear bearing
(fig. 3G). Tap gently on end mainshaft and remove
extension from mainshaft.
DISASSEMBLY OF M A IN SH A FT (Fig. 4G)
1. Depress speedometer gear retaining clip and slide
gear from mainshaft.
2. Remove rear bearing snap ring from mainshaft
groove.
3. Support reverse gear with press plates and press on
rear of mainshaft to remove reverse gear, thrust
washer and rear bearing from shaft.
CAUTION:
When pressing rear bearing be
careful to center gear, washers, and bearing on
shaft.
Countergear Anti-Lash Plate.................................... 7M-16
Repairs................................................................................. 7M-16
Clutch Keys and Springs
Replacement.................................................................... 7M-16
Extension Oil Seal or Bushing................................. 7M-16
Clutch Bearing Retainer Oil Seal.......................... 7M-16
Assembly of Mainshaft................................................. 7M-16
Assembly of Transmission............................................ 7M-18
4. Remove 1st and reverse sliding clutch hub snap
ring from the mainshaft.
5. Support 1st gear with press plates and push on rear
of mainshaft to remove the clutch assembly, blocker
ring and 1st speed gear.
CAUTION:
Exercise care to prevent distortion
of snap rings during expansion.
6. Using snap ring pliers, remove the 2nd and 3rd
speed sliding clutch hub snap ring from mainshaft.
7. Support 2nd speed gear with press plates and press
on front of mainshaft to remove clutch assembly,
second speed blocker ring and second speed gear
from shaft.
This completes the disassembly of mainshaft.
CLEANING AND INSPEC TIO N
Transmission Case
1. Wash the transmission thoroughly inside and
outside with cleaning solvent, then inspect the case
for cracks.
2. Check the front and rear faces for burrs, and if
present, dress them off with a fine mill file.
3. Check bearing bores in case and, if damaged,
replace case.
Front and Rear Bearings
1. Wash the front and rear ball bearings, thoroughly
in a cleaning solvent.
2. Blow out bearings with compressed air.
CAUTION:
Do not allow the bearings to spin,
turn them slowly by hand. Spinning bearings
will damage the race and balls.
3. Make sure bearings are clean, then lubricate with
light engine oil and check them for roughness by
slowly turning the race by hand.
Bearing Rollers
All drive gear and countergear bearing rollers should be
inspected closely and replaced if they show wear. Inspect
OVERHAUL MANUAL