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Removal (Fig. 4)
1. Park machine on a level surface, fully raise coring
head, stop engine and remove key from the ignition
switch. Secure coring head with service latch.
2. Make sure parking brake is disengaged.
3. Block front wheel. Jack or hoist rear of machine from
ground and support machine with blocking or jack
stands (see Operator’s Manual and Jacking Instructions
in Chapter 1 – Safety).
4. Remove rear wheel assembly (see Wheel Removal
in this section).
CAUTION
Be careful when removing extension spring from
parking latch pivot. The spring is under heavy
load and may cause personal injury.
5. Remove parking brake components as needed us-
ing Figure 4 as a guide.
6. If parking latch disc requires removal:
A. Loosen, but do not remove, nut that secures
wheel hub to wheel motor shaft.
IMPORTANT: To prevent damage to hydraulic motor,
DO NOT hit wheel hub or motor with a hammer dur-
ing wheel hub removal or installation.
B. Loosen wheel hub assembly from motor shaft us-
ing wheel hub puller (see Special Tools). Once wheel
hub is loose on shaft, remove nut and wheel hub from
motor shaft. Locate and retrieve woodruff key from
motor shaft.
C. Remove wheel studs to allow separation of park-
ing latch disc, wheel hub and bearing plate.
7. Clean all parts. Inspect parking latch bar and parking
latch disc for excessive wear or damage. Replace any
damaged parts.
Installation (Fig. 4)
CAUTION
Be careful when installing extension spring to
parking latch pivot. The spring is under heavy
load and may cause personal injury.
1. Install removed parking brake components using
Figure 4 as a guide.
2. If wheel hub assembly was removed:
A. Make sure that wheel studs are installed through
parking latch disc, wheel hub and bearing plate.
B. Make sure that wheel motor shaft and wheel hub
taper are thoroughly cleaned.
C. Position woodruff key into wheel motor shaft.
D. Install wheel hub assembly to wheel motor shaft
and secure with nut. Torque nut from 190 to 230 ft–lb
(258 to 312 N–m).
3. Install wheel assembly (see Wheel Installation in this
section).
4. Lower machine to ground. Remove service latch
from coring head before machine use.
Chassis
ProCore 648 Page 6 – 7 Chassis