TRANSMISSION - SPECIFICATIONS

1.3 SEALANT AND ADHESIVE SPECIFICATIONS

Clutch housing, transmission case, rear axle case docking section

* Clutch housing, transmission case, rear axle case docking section's stud bolt

* Top link bracket anti-loose nut

* Ball joint end connection

Spiral bevel gear (ring gear) & differential case cap mounting bolt, PTO shaft sleeve

Differential pinion, side gear, differential and pinion gear shafts

Front axle case lower plug

Elbow without O-ring in hydraulic line

Hydraulic part filling plug

Auxiliary hydraulic tube's filter connector and hydraulic quick coupler connection

Liquid gasket

Adhesive for preventing bolt & nut looseness

Loctite® 5060 or equivalent

ThreeBond® 1324B or equivalent

Preventing bolt & nut looseness, sleeve adhesion

Section contacted with oil

Initial lubrication, sticking prevention

Sealing and adhesion

Sealing and adhesion

Sealing and adhesion

Sealing and adhesion

ThreeBond® 1372

ThreeBond® 1901

Loctite® 5060

Loctite® # 573

Loctite® TL-271

Loctite® # 572

Transmissionstructure And Operating Principle

2. STRUCTURE AND OPERATING PRINCIPLE

2.1 MAIN GEAR SHIFT SECTION

After rotating power of the engine is delivered to the main shaft (1), it turns the pump input shaft (3) of the HST through the coupling (2). Then, the motor shaft in the HST is rotated by hydraulic pressure of the pump. As a result, 22 gear, which is connected to the HST motor output shaft (4) with splines, rotates to turn the engaged 29 gear of the gear shaft (5). Finally, as the 29 gear is connected to the gear shaft with splines, its rotation turns the gear shaft.

Transmissionstructure And Operating Principle

2.2 OPERATING PRINCIPLE OF SYNCHRONIZER

There is synchronized shifter on the 11 gear shaft for main gear shift. The shifter is for 2nd and reverse gear shift and it has a synchronizer function so that the gear shifting is available while driving.

If the clutch is disengaged for gear shift while driving, the engine power is not transmitted, but the tractor continues to move due to the inertia.

The 11 gear shaft and the shifter are connected to the final drive through the range shift section. Therefore, they rotate as the wheels rotate. However, the gears on the 11 gear shaft rotate idle or stop with the gears on the one shaft while the clutch is disengaged. If there is no synchronizer, the speed difference between the shifter and the shift gear occurs and the gear shift is impossible unless the tractor stops completely. The synchronizer reduces the speed difference between the shifter and the shift gear so that it is possible to shift while driving.

The above figure shows the initial stage of the shifting operation. The shifter (2) is moved by the shift fork and compresses the synchronizer key (1) which then compresses the synchronizer ring (3) to the cone of the gear (4). Therefore, the gear (4) rotates at the same speed with the shifter (2) and the synchro hub (5) due to the friction of the synchronizer. This is called "synchronization."

The above figure shows the final stage of the shift operation. As the gear (2) and the shifter (1) are synchronized, the inner teeth of the shifter (1) and the outer teeth of the gear (2) are engaged smoothly for the proper shift operation.

2.3 RANGE SHIFT SECTION

Transmissionstructure And Operating Principle

As the 36-27-18 gear shaft is fixed to the 29 gear with splines and rotates together, the 34 gear of the spiral bevel pinion, which is engaged with the 18 gear, idles by its internal needle bearing.

When the 17-26 gear is moved to the right to be connected to the 34 gear, the speed ratio for the 18 gear and 34 gear is selected and power is delivered to the spiral bevel pinion through the 17-26 gear.

When the 27 gear of the 36-27-18 gear shaft is engaged with the 26 gear of the 17-26 gear, the speed ratio for range M shift is selected and power is delivered to the spiral bevel pinion through the 17-26 gear. Also, when the 17-26 gear is moved to the left, the 17 gear is engaged with the 36 gear so the speed ratio for range H shift is selected.

2.4 PTO GEAR SHIFT SECTION

Transmissionstructure And Operating Principle

After the engine's rotating power is delivered to the main clutch and main shaft (1), it turns the HST pump shaft. As the PTO drive shaft 1 (2) is connected to the pump output shaft, power is delivered to the PTO drive section through the shafts.

As the HST pedal is used to cut the driving section, the main clutch is used as a live PTO to connect and disconnect PTO power.

The PTO speed selection mechanism works the same as the mechanical model mentioned earlier.

Transmissionstructure And Operating Principle

2.5 FRONT WHEEL DRIVE SECTION

As the 30 gear is fixed to the spiral bevel pinion (1), rotating power delivered to the pinion turns the 30 gear constantly When the 38 gear of the 4WD shaft (2) is moved to be engaged with the 30 gear, rotating force supplied to the 30 gear through the spiral bevel pinion turns the 4WD shaft through the 38 gear and it is delivered to the propeller shaft (3) through the coupling. As a result, the front wheels are rotated by the front axle.

TRANSMISSION - INSPECTION AND ADJUSTMENT

3. INSPECTION AND ADJUSTMENT

3.1 SYNCHRONIZER GEAR INSPECTION

Shifter And Coupling

Clearance Between Synchronizer Ring And Gear

Check the shifter and coupling for wear or damage. Also, check the key way of the coupling. Engage the coupling with the shifter to check for smooth operation.

Check if the gear spline is cracked or worn. If any damage is found, replace the part with a new one.

Synchronizer Key And Spring

1. Press the synchronizer ring against the beveled side of the gear with the feeler gauge and measure the clearance between them as shown in the figure.

2. Coat the beveled side with thin contact grease and press the ring against the gear with a hand several times to rub against each other. Then, check its contact.

3. Check the teeth surface and key way of the ring for wear.

4. If the clearance is out of the allowable limit or the ring is damaged, replace the synchronizer ring with a new one. Allowable clearance limit ....... 0.35 mm (0.0138 in)

Contact of beveled side: 80% higher area in contact A13W471A

Check if the protrusion in center of the synchronizer key is worn.

Check the spring section in contact with the key for wear. If any damage is found, replace the part with a new one.