R380 GEARBOX. Manual — part 12
MANUAL GEARBOX
OVERHAUL
27
Selectors - Inspection
1. Examine selector rail and pins for wear and
damage.
2. Examine selector forks for wear and damage.
NOTE: The selector rail and fork is only
supplied as a complete assembly.
3. Examine interlock spools for wear and
damage.
Selector quadrant - Type A gearbox
Examine selector quadrant and check for wear.
Selector yoke - Type B and D gearboxes
Selector yoke - Type C gearbox
4. Remove snap ring and examine selector yoke
assembly.
MANUAL GEARBOX
28
OVERHAUL
Assembling selectors.
1. Rest 1st/2nd fork and shaft assembly on bench
and locate pin in jaw of fork.
2. Fit interlock spool and 3rd/4th fork and engage
spool in jaw of fork.
3. Slide spool and fork towards 1st/2nd selector
until slot in spool locates over pin keeping the
spool engaged in 3rd/4th fork jaw.
GEARBOX REASSEMBLE
Mainshaft and layshaft end float
NOTE: The end float setting for both the
mainshaft and the layshaft has to be
determined before the gear box can be
reassembled. This is achieved by clamping the
mainshaft and layshaft separately between the
centre plate and main casing and measuring the
movement on each shaft with a Dial test
indicator.
The end float setting for the mainshaft and
layshaft is 0.01 - 0.06mm (0.0004 - 0. 0024in).
Shims to make up the required clearances are
placed under the bearing tracks of the centre plate.
Shimming
1. Fit bearing tracks to main casing front cover.
2. Fit front cover to casing without oil seal.
3. Clamp casing in vice with front cover
downwards.
4. Fit input shaft. Do not fit 4th gear baulk ring.
5. Fit mainshaft assembly to input shaft.
6. Fit mainshaft bearing shim and track to centre
plate.
MANUAL GEARBOX
OVERHAUL
29
7. Fit centre plate and bolt down using 8 ’slave’
bolts.
8. Fit large ball bearing to rear of mainshaft.
9. Mount dial test indicator.
10. Rotate mainshaft to settle bearings.
11. Lift mainshaft and note reading.
12. Dismantle and substitute shims if reading
incorrect.
13. Repeat procedure.
14. Remove mainshaft assembly and repeat
procedure for layshaft.
15. Dismantle assembly in preparation for
assembly on stand.
Assembling mainshaft and layshaft to centre
plate
1. Secure centre plate to workstand.
2. Fit selected shims and bearing tracks.
3. Fit inboard detent ball and spring, use a
dummy bar to temporarily hold the ball in
place.
4. Check both synchromesh units are in neutral
and fit selector shaft assembly to mainshaft.
5. Fit mainshaft and selectors as complete unit to
centre plate aligning pin with slot in plate.
6. Fit 4th gear synchromesh baulk ring.
MANUAL GEARBOX
30
OVERHAUL
7. Fit layshaft whilst lifting mainshaft to clear
layshaft rear bearing.
8. Lubricate pilot bearing and fit input shaft.
9. Fit oil seal to front cover. Ensure seal is fitted
down to shoulder. Apply Hylosil RTV 102 to
front cover as shown.
NOTE: Early type seal - unwaxed -
lubricate seal with gearbox oil.
Later type seal - wax coated - fit seal dry.
10. Fit bearing tracks and clips to main case and fit
front cover. Seal fixings with Hylogrip 640.
11. Apply Hylosil RTV 102 and fit main casing to
centre plate.
12. Bolt casing and centre plate together using 2 or
3 ’slave’ bolts.
13. Fit new ’O’ ring and fit spool retainer.
14. Remove casing from stand and clamp in vice.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст