Twin Disc TECHNODRIVE TMC 40 P Manuel D'utilisation page 5

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Before to start the engine make sure that the gearbox is in neutral position.
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The gearbox should only be shifted with the engine at idle speed so as to avoid that the gearbox or the
coupling may be demaged.
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Disassembly and assembly of the gearbox or of its parts is to be made by specialized technicians only.
REVERSE-GEAR UNIT DISASSEMBLY
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Disassembly and assembly of the gearbox or of its parts is to be made by specialized technicians only.
In order to completely disassemble the reverse-gear unit, operate as follows:
- Remove the reverse-gear control unit by unscrewing M8 two nuts ref. 56 and extracting the whole unit (control lever ref.
18, cover ref. 3, shaft ref. 13, guide shoe ref. 21, screw ref. 28, nut ref. 57) carefully avoiding to drop guide shoe ref. 21
into the reverse-gear unit as it has no axial lock.
- Remove output flange ref. 26 from the reverse-gear unit by unscrewing nut ref. 19 and by extracting the flange from the
shaft spline.
- Loosen fastening screws ref. 47 located between the box and the cover and, gently, beat the head of output shaft ref. 12
with a copper hammer in order to separate the box from the cover.
- Unscrew the fastening screws ref. 48, remove the cover ref. 5 and the oil seal ref. 33
- While the reverse-gear unit is open, loosen screw ref. 50 which fastens the intermediate shaft to the reverse-gear cover
and remove the wole intermediate shaft ref. 14. Remove input shaft ref. 11 together with bearings ref. 37 and 38, and the
whole output shaft ref. 12.
- In order to disassemble the clutch cone from the output shaft, extract all parts according to the following sequence: bearing
ref. 54 located on the flange side, spacer ref. 8, gear ref. 25, pin housing cage ref. 35, bush ref. 29 spacer ref. 8 and clutch
cone ref. 22.
- In order to complete the disassembly of the output shaft remove nut ref. 19 and extract, in the following order, bearing
ref. 55, spacer ref.8, gear ref. 24, pin housing cage ref. 35, bush ref. 29 and spacer ref. 8.
- Spacers ref. 6 are located between cover ref. 2 and bearing ref. 55; therefore, in order to remove them it is necessary to
remove screws ref. 51 and the cover ref. 2.
In order to disassemble the intermediate gear ref. 23, extract all parts according to the following sequence: spacer ref.9,
gear ref. 23, bearings ref. 36.
REVERSE-GEAR UNIT REASSEMBLY
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Disassembly and assembly of the gearbox or of its parts is to be made by specialized technicians only.
- Output shaft unit assembly: orderly assemble, starting from the end opposite the output flange, spacer ref. 8, bush ref.
29, bearing ref. 35, gear ref. 24, spacer ref. 8, bearing ref. 55, nut ref. 19 (torque wrench setting 125 Nm). Tighten the
stop nut in the appropriate place on the shaft. Insert clutch unit ref. 22 and moving toward the output flange end, assemble,
in sequence, the following parts: ref. 8, 29, 35, 25, 8, 54.
- Intermediate shaft assembly: assemble bearings ref. 36, gear ref. 23 and spacer ref. 9.
- Input shaft assembly: the gears are enbloc with the shaft; therefore it is necessary only to assemble the two ball bearings
ref. 38 and 37.
- Shafts assembly on cover: place cover ref. 1, with the bearing seat upward, on a horizontal surface with a hole which
allows the protuding part of shaft ref. 12. Place the assembled input shaft, insert the assembled intermediate shaft. Insert
the assembled output shaft. Insert pins ref. 46. Assembled the cup of bearing ref. 55 on the box ref. 4, insert sealing paste
into the connecting surface between the cox and the cover and close by tightening screws ref. 47. Insert the washer ref.
7 tightening the screw ref. 50 to 29 Nm. Place the cover ref. 5 inserting sealing paste on the contact surface, screw the
fixing bolts ref. 48. Bearing ref. 54 and 55 are to be adjusted with a pre-load of 0,05 mm to 0,10 mm. Shims must be
inserted between bearing ref. 55 and cover ref. 2. Insert sealing paste between cover ref. 2 and 4 and close by tightening
screw ref. 51. Assemble oil seals ref. 33. Insert flange ref. 26 on the output shaft spiine tighten the screw ref. 19 to torque
of 125 Nm.
- Drive unit assembly: upon positioning spring ref. 10 on the stem of guide shoe ref. 21, insert it into the hole of drive shaft
ref. 13. Guide shoe ref. 21 must be positioned with its beveled side upward (behind the v-shaped surface touching the
clutch-unit). Insert the complete drive unit assembly (cover ref. 3, shaft ref. 13, spring ref. 10, guide shoe ref. 21) into the
reverse-gear unit box making sure to maintain the guide shoe position described above and to avoid dropping the guide
into the casing. Fasten both bolts ref. 56 and assemble control level ref. 18 fastening it by means of screw ref. 49.
- Clutch control unit adjustment: with the operating lever ref. 18 in neutral position, turn by hand the output flange ref. 26
and, at the same time, screw the adjusting screw ref. 28 with an alien wrench (4 mm) until the output flange rotation gets
hard on a small arc only. Unscrew of 3/4 of turn the adjusting screw and fix it by locking the nut ref. 57.