IV-27
HYDRAULIC UNITSHST PUMP
Adjustment of Rotational Torque of the
Servo Piston
The adjustment should be performed so that the load
of the spring (52) is applied to the snap ring (48),
and the tie bolt (16) rotates freely.
1. Secure the nut (50) with a wrench, and tighten
the tie bolt (16) manually by turning it to the left
until firm.
2. With the nut (50) secured, tighten the tie bolt
(16) by a wrench by turning it to the left.
• Tighten the bolt until the spring (52) starts
compressing.
3. Turn the tie bolt (16) approximately 1/16 turn to
the right.
4. With the nut (50) secured, tighten the nut (49) to
the stipulated torque.
Nut: 20~27 N·m
Measurement of the Servo Piston’s Rota-
tional Torque
Check whether the servo piston·s rotational torque is
properly adjusted:
1. Secure the servo piston (20) with your hand to
prevent it from turning.
2. Rotate the tie bolt (16) for neutral adjustment
and measure the torque required for rotation.
• Measure the torque after the tie bolt (16) for
neutral adjustment starts rotating.
Rotational torque: at least 1.13 N·m
• The rotational torque of the servo piston must
satisfy the lower limit value in both rotational
directions.
• During measurement of torque, the nut (50)
may rotate, but the upper spring guide (51)
must not rotate.
• If the stipulated rotational torque is not ob
-
tained, readjust the rotational torque of the
servo piston again.
S3F335
16
49
50
52
48
S3F336
16
20
S3F337
20 51 50 16
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