4HST
50
4.4 Inspection and Adjustment of HST
1 Neutral Adjustment of HST
1. Position the trunnion arm to the detent valve position.
2. Turn the shaft holder to set the roller of the neutral arm to the neutral position of the trunnion arm. Tighten the
bolt.
3. Set the spring length to 92mm {3.62in} in neutral.
4. Check the below items after adjusting.
• Operate the HST pedal to make sure it forwards and reverse.
• It stays stopped in neutral.
2 Adjustment of Speed Control Lever
1. Set the speed control rod length to 418mm {16.46in} and install.
2. Adjust the backlash of the speed control lever within 25 to 30 mm {0.98 to 1.18in} with nut.
3. Check the below items after adjusting.
• It can be locked or released with HST pedal stepped into forward side.
• Lock HST pedal in forward side, middle position. HST pedal will return to the middle position when HST
pedal is stepped further and then released.
• It cannot be locked when HST pedal is moved to the reverse side and the speed control lever is positioned in
the lock position. HST pedal will return to the neutral position.
3 Adjustment of Stopper for HST Pedal
1. Forward Side Stopper:
1) Loosen the locknut for forward stopper and tighten the bolt.
2) Move the HST pedal to the forward side.
3) Loosen the forward stopper bolt and attach to the HST pedal. Loosen the bolt 1/2 turn and tighten the
locknut.
2. Reverse Side Stopper:
1) Loosen the locknut. Adjust the stopper bolt to the referential measurement 21.5mm {0.846in} and tighten
the locknut.
CAUTION
Stop the engine when checking the speed control lever.
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