The ball ramp device gives axial movement of the input gear when the input gear turns at a lower speed than the input shaft. The device is a coupling made by three balls. These are installed between the input gear and the input shaft in machined grooves (ramps).
 The earthed plates and the friction discs are installed on the input gear. The spring discs and the thrust cup are installed on the input shaft.
 The lockout indicator gives a visual indication that the torque limiter has operated. It has a lockout indicator arm and a plunger. These are operated by movement of the thrust cup.
 (a) Operation
 Input from the torque shaft is transmitted by the input shaft to
 turn the input gear through the ball ramp device.
 Output from the input gear is transmmitted through the idler gear
 and the gear wheel assembly to the rotary actuator.
 Output from the input shaft is transmitted by torque shafts,
 through the bevel gearbox, to the actuator at track 3.

 During usual operation, the input shaft, the input gear and the
 friction discs turn at the same speed. If the torque reaction at
 the rotary actuator is too high, it causes the input gear to turn
 more slowly than the input shaft. This difference in speed causes
 the input gear to move the balls up the ramps in the input shaft
 and the input gear. When this occurs, the input gear moves
 against the pressure of the spring discs. This compresses the
 friction discs against the earthed plates and causes the unit to
 lockout.

 When the torque limiter is compressed, the thrust cup moves
 against the pressure of the spring discs. The thrust cup touches
 the plunger which extends the lockout indicator arm. This gives a

R 1EFF : 062-099, 106-149, 151-199, 204-299, 1 27-54-00Page 60 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1 visual indication that the torque limiter has operated. The indicator arm stays extended until it is pushed in manually to cancel the indication.

 The system can be set again by operation in the opposite direction.
 (3) Rotary Actuator - Track 2 (Ref. Fig. 023A) The description and operation for the track 2 rotary actuator is the
 same as that for the rotary actuator at track 1.
 **ON A/C ALL

 H. Actuator Track 3 6221CM(6271CM)
 **ON A/C 001-049, 051-061, 101-105, 201-203,

 (Ref. Fig. 026) R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
 (Ref. Fig. 026A)
 **ON A/C 001-049, 051-061, 101-105, 201-203,

 (Ref. Fig. 027) R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
 (Ref. Fig. 027A)
 **ON A/C 001-049, 051-061, 101-105, 201-203,

 The actuator is almost the same as the actuator for track 1. The differences are:
 -in the offset gearbox are bevel gears as an alternative to spur gears
 -installed on this actuator is a longer type of rotary actuator, the same as at track 2.

 Actuator - Track 3 Figure 026 
R 1EFF : 1 1 1CES  001-049, 051-061, 101-105, 201-203,  1 111 27-54-00 Page 62 May 01/05

 Actuator - Track 3
 Figure 026A

R 1EFF : 062-099, 106-149, 151-199, 204-299, 1 27-54-00Page 63 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1

 Offset Gearbox - Track 3
 Figure 027

R 1EFF : 001-049, 051-061, 101-105, 201-203, 1 27-54-00Page 64 1 1 May 01/05 1 1 1CES 1

 Offset Gearbox - Track 3
 Figure 027A

R 1EFF : 062-099, 106-149, 151-199, 204-299, 1 27-54-00Page 65 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1

R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,

 The actuator is an assembly that has:
 -an offset gearbox
 -a rotary actuator.
 (1) Offset Gearbox - Track 3
 The offset gearbox has:
 -an actuator housing
 -
a gear housing

 -
a bevel gearbox

 -
a torque limiter housing

 -
a torque limiter.

 The actuator housing is a machined casting which contains the rotary actuator.
 The gear housing is bolted to the actuator housing and contains a bevel gear assembly and a pinion shaft. The pinion shaft is splined and has a bevel pinion at each end. At one end the bevel pinion engages with the bevel gear assembly in the gear housing. At the other, the pinion engages with a bevel gear in the bevel gearbox. The bevel gearbox is bolted to the gear housing.
 The torque limiter housing contains an input shaft and a torque limiter and is bolted to the bevel gearbox. The input shaft connects to the bevel gear in the bevel gearbox. Drive is transmitted from the input shaft to the bevel gear through six drive-balls.
　
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