DETROIT DIESEL 53
1.7.7 Accessory Drive
Fig. 3 Air Compressor Drive
Fig. 4 Hydraulic Pump Drive
hub, coupling and drive plate (Fig. 3) or a spacer.
Remove Accessory Drive
drive plate. drive coupling and hub (Fig. 4).
Remove the direct gear driven type accessory drive as
follows:
1. Remove any external piping or connections to the
accessory.
The drive plate and spacer. when used, are bolted to
2. Remove the five bolts and lock washers attaching
the camshaft or balance shaft gear. The accessory is
the accessory to the flywheel housing. Pull the
bolted to the flywheel housing and driven by a drove
accessorv straight out from the flywheel housing.
hub keyed to the accessory shaft and splined to the
coupling which is splined to the drive plate attached to
3. Remove the drive coupling
the camshaft or balance shaft gear. The current drive
coupling. shown in Fig. 4. has 21 external teeth; the
4 . Remove the drive hub from the accessory shaft, if
former coupling had 23 external teeth.
neccessary.
Belt driven accessories. such as battery-charging
5. Place a clean cloth in the flywheel housing
generators or air compressors. are driven off the
opening, underneath the accessory drive plate, to
camshaft or balance shaft gears by a drive hub and
prevent bolts from accidentally falling into the gear
pulley (Fig. 5). or a spacer. accessory drive plate.
train. Remove the lock wires, if used and remove the
accessory drive shaft. accessory drive retainer
four bolts (and lock if used) and remove the
assembly and pulley (Fig. 6).
accessory , the drive plate and the spacer, if used.
Remove the drive assembly for a type
In the first arrangement. illustrated in Fig. 5. the drive
accessory as follows:
hub is bolted to the camshaft or balance shaft gear.
The oil seal retainer is bolted to the flywheel housing
1. Remove any external piping or connections to the
and the pulley is keyed to the drive huh shaft which
accessory.
extends through the oil seal retainer.
2. Loosen the accessory and slide it toward the drive
In the second arrangement. shown in Fig. 6. the
pulley. Then remove the drive belt and accessory.
spacer and accessory drive plate are bolted to the
camshaft or balance shaft gear. The accessory drive
3. Remove the bolt and washer (Fig .5) or nut
(Fig.6) retaining the pulley on the drive shaft.
shaft is splined to the drive plate at one end and
supported by a bearing in the accessory drive retainer
4. Use a suitable gear puller to remove the pulley from
at the other end. The accessory drive retainer. which
the drive shaft. Remove the Woodruff key.
also incorporates an oil seal. is bolted to the flywheel
housing. The pulley is keyed to the drive shaft which
5. Remove the five bolts and lock washers which attach.
extends through the drive retainer assembly.
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