Remove Rotor Transmission
a. remove lubricant circulating pump drive sheave
b. remove shear disc group.
1. Disconnect the transmission shift linkage (1) from the bell crank rod.
2. Disconnect the lubricant hose (2) from the top of the transmission. Cap or plug all openings.
3. Attach a lifting device to the transmission (3) and take the slack out of the lifting lines.
4. Unbolt and remove the rear support (4) from the transmission and mainframe.
5. Unbolt the transmission from the front support (5).
6. Lower the transmission until the bolts are clear of the front support.
7. Move the transmission rearward until the transmission is clear of the front support.
8. Lift the transmission straight up out of the rotor drive compartment.
Install Rotor Transmission
1. Attach a lifting device to the transmission. Lower the transmission into the rotor drive compartment and into position beneath the front support.
2. Raise the transmission (3) until the bolts are through the front support (5), then loosely install the nuts.
3. Bolt the rear support (4) to the transmission and mainframe.
4. Tighten all bolts and nuts, then disconnect the lifting device.
5. Thoroughly clean around the hose end and the transmission port, then connect the lubricant hose (2) to the top of the transmission.
6. Pin the transmission shift linkage to the bell crank rod.
a. install shear disc group
b. install lubricant circulating pump drive sheave.
Disassemble Rotor Transmission
a. remove rotor transmission
1. Remove the mounting capscrews, then remove the top cover.
2. Remove the nuts and lockwashers from the studs which attach the front bearing housing to the case. Do not remove the housing.
3. From inside the case, use a mall and a soft bar to force the drive gear (1) forward until its front face strikes the inside wall of case.
4. Remove the attaching capscrews and remove the rear bearing cover (2) from rear of case. Remove the oil seal (3) from cover if necessary.
5. Remove the speedometer gear (4) or replacement spacer from the rear of the mainshaft.
6. Remove the speedometer gear washer (5) from the rear of mainshaft.
7. From inside the case, use a mall and a soft bar to force the mainshaft assembly to the rear until rear face of low speed gear (6) strikes the inside wall of case.
8. Remove the tension spring screw, tension spring, and tension ball (7) from vertical bore (8) in right side of case.
9. Locate the mainshaft washer key which is installed in keyway between the splines of the mainshaft under the sliding clutch gear. Turn the shaft so the key is in an uppermost position.
10. With the mainshaft held in its rearmost position, drive against the sliding clutch gear (9) with a soft bar to move the pilot bearing forward on mainshaft until the mainshaft key (10) is completely exposed.
11. Remove the mainshaft key (10) from its keyway between splines of shaft.
12. Inside the pocket of the low speed gear, turn the splined thrust washer (11) in its groove until the lugs on its inside diameter line up with the grooves in the shaft.
13. Move the mainshaft to the rear, sliding the splined thrust washer forward along the splines of mainshaft.
14. Move the pilot bearing (12) forward with the sliding clutch gear (9) and into pocket of drive gear (1) to completely unseat pilot bearing from shaft.
15. Pull mainshaft (13) out through rear bore of case.
16. Remove the loose parts consisting of the pilot bearing, sliding clutch gear, splined washer and low speed gear from the case.
17. Press the rear bearing (14) from the mainshaft (13).
18. Remove the low speed gear rear thrust washer from the shaft.
19. Press the low speed gear sleeve (15) from the mainshaft (13).
20. Remove the woodruff key from the mainshaft.
21. Cut the lockwire and remove the lockscrew from the shifting yoke.
22. Withdraw the shifting bar (16) out through front bore of case and remove the shifting yoke (17) from case.
23. If necessary, remove the shifting bar packing and packing retainer (18) from front shifting bar bore in case and remove the welch plug from rear shifting bar bore.
24. Using soft bar, drive against the front end of drive gear shaft to force the drive gear (1) to the rear and through bearings and bearing housing (20).
25. Tap lightly and pull forward evenly to remove the front bearing housing (20) from case studs.
26. Remove the spacer and oil deflector. These parts will be loose either in the housing or on drive gear shaft.
27. Move the drive gear (1) forward to lightly tap main bearing (21) forward and out of case bore.
28. Remove the drive gear (1) from inside of case.
29. Remove the outer bearing in front bearing housing out through rear of housing. Jar housing on wood block or use bearing driver to remove.
30. Remove the oil seal from front bearing housing. Move seal forward and out of housing.
31. If necessary, remove breather from bearing housing.
32. Cut lockwire, remove capscrews (23) and remove the rear bearing retainer plate (22) from rear of the countershaft.
33. Remove capscrews and remove the countershaft front bearing cover and front bearing spacer (24).
34. Move countershaft assembly to the rear to expose the rear bearing (25) outside of the case bore.
35. Remove the rear bearing (25) from countershaft.
36. Tilt the countershaft (26) and remove through top of case.
37. Remove the front bearing (27) from countershaft (26).
38. Remove the gear retaining snap ring (28) from front of countershaft.
39. Press the drive gear (29) from countershaft (26).
40. Remove the key from keyway in countershaft.
Assemble Rotor Transmission
1. Clean and inspect transmission parts as follows:
a. Wash all bearings in clean solvent. Check balls, rolls and races for pits and spalled areas. Check bearing shields for damage. Replace bearings which are pitted, spalled or damaged.
b. Lubricate bearings and check for axial and radial clearances. Replace bearings that have excessive clearances.
c. Check fits of bearings in the case bores. If outer races turn freely in the bores, the case should be replaced.
d. Check operating gear teeth for pitting on the tooth faces. Gears with pitted teeth should be replaced.
e. Check all engaging gear teeth both internal and external. Gears with teeth worn, tapered or reduced in length from clashing in shifting should be replaced.
f. Check radial clearance of bushed gear. If excessive radial clearance is found, replace the bushing.
g. Check splines on all shafts for wear. If sliding gears or companion flanges have worn into the slides of the splines, the shafts or gears in this condition should be replaced.
h. Check surfaces of washers. Washers scored or reduced in thickness should be replaced.
i. Check yoke for alignment; straighten if sprung.
j. Check lockscrew in yoke; tighten and rewire if found loose.
k. Check neutral notches of shifting bar for wear from tension spring ball.
l. Check covers for wear from thrust of adjacent bearing. Replace covers worn and grooved from thrust of bearing outer race.
m. Check lip of seals for wear, cracks or breaks. Check tension of lip on sealed surface. Replace seals in which lip is damaged or in which lack of tension has destroyed the wiping action of the lip.
2. Install the key in keyway in countershaft.
3. Press the drive gear (29) onto countershaft (26), long hub to the rear.
4. Install the gear retaining snap ring (28) on front of countershaft.
5. Install the front bearing (27) on countershaft (26).
6. Lower countershaft (26) into position in case inserting front bearing into front bore of case.
7. Block against front of countershaft (not bearing) and install the rear bearing (25) on shaft and into case bore.
8. Install the rear bearing retainer plate (22) on rear of countershaft. Tighten capscrews (23) securely and install lockwire.
9. Install the front bearing spacer (24) in front countershaft bore.
10. Install the countershaft front bearing cover, tighten capscrews securely.
11. Remove the snap ring from the main drive gear bearing.
12. Press the main bearing (21) on drive gear, seating bearing against shoulder of gear with snap ring groove towards the front.
13. Install the drive gear (1) and bearing from inside the case, moving bearing forward in bore until snap ring groove in bearing is exposed.
14. Install the snap ring (30) in groove in bearing. Leave drive gear in this position in order to provide space for installation of the mainshaft assembly.
15. If previously removed, install a new shifting bar packing and new packing retainer (18) in the front shifting bar bore. Install flush with front face of case.
16. If previously removed, install welch plug in rear shifting bar bore. Seat plug with shellac to prevent oil leakage.
17. Insert shifting bar (16) through front bore and through the shifting fork (17). Position yoke with the lockscrew bore towards the rear.
18. Install the yoke lockscrew, tighten and wire securely.
19. Install the Woodruff key in keyway in mainshaft.
20. Install the low speed gear sleeve (15) on mainshaft (13).
NOTE: Front edge of sleeve (15) should be flush with rear edge of splined thrust washer groove (31) in mainshaft as splined washer must be able to turn in groove when installed.
21. Make sure the drive gear is moved forward so that drive gear is against inside wall of case.
22. Install the mainshaft pilot bearing (12) into the pocket of drive gear (1).
23. Install the sliding clutch gear (9) into position in case and into engagement with the drive gear (1). Install with recess to the rear. At the same time, insert shifting yoke (17) into yoke slot in gear.
24. Install the low speed gear into position in case with the clutching teeth to the front.
25. Install the mainshaft through the rear bore of case and through the low speed gear (6). As the mainshaft is moved forward through the gear, fit the splined thrust washer (11) in grooves of mainshaft. Shoulder of washer is to the front.
26. Continue to move mainshaft forward through sliding clutch gear (9), starting to seat pilot bearing on front of mainshaft. Move shaft forward until splined thrust washer is seated in groove in mainshaft.
27. Turn the splined washer in its groove on mainshaft until lugs on its inner diameter line up with raised splines of mainshaft.
28. Install the mainshaft key (10) in its keyway between splines of mainshaft, inserting lower end of key between lugs of washer.
29. Continue to move the mainshaft (13) forward in order to completely seat the pilot bearing on front of mainshaft and at the same time moving the sliding clutch gear back on mainshaft.
30. Install the low speed gear rear washer (32) over rear of mainshaft (13) and against the low speed gear, oil slots toward gear.
31. Install the mainshaft rear bearing (14), seating bearing on shaft and into case bore. When correctly seated, washer between bearing and gear hub should be tight.
32. Install the speedometer gear washer (5) over rear of shaft and against bearing, chamfered inner diameter towards bearing.
33. Install the speedometer gear (4) or replacement spacer on mainshaft.
34. Install the rear bearing cover, tighten capscrews securely. Install capscrews in a staggered or opposite sequence, tighten a top capscrew, then a bottom capscrew, etc.
35. If previously removed, install the oil seal (3) in rear bearing cover (2). Seal should be flush with rear face of cover.
36. Move the drive gear to the rear and into correct position, seating snap ring of bearing in recess in case bore. Recheck mainshaft pilot bearing for correct seating in drive gear bore.
37. Install the oil deflector on shaft and against bearing, fins toward the front.
38. Install the bearing spacer on drive gear shaft and against oil deflector.
39. Install the outer bearing (36) on drive gear shaft, seating tightly against spacer, shield to the outside.
40. Install the front bearing housing (20), seating outer bearing in housing and housing on studs. Secure with lockwashers and nuts.
41. Install the oil seal (37) in front bore of bearing housing. Seal should protrude 5.2 mm (.203 in) from face of housing.
42. If previously removed, install the breather in housing.
43. Install the tension ball, tension spring and tension screw (7) in vertical bore (8) in side of case. Make sure the shifting bar is in the neutral position.
44. If previously removed, install pipe plug in top bore in case.
45. Install the top cover on case, tighten capscrews securely.
a. install rotor transmission