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8. Disconnect upper end of lift cylinder from coring
head frame (Figs. 22 and 23):
A. Remove retaining ring from one end of cylinder
pin that secures lift cylinder to coring head frame.
B. Pull cylinder pin from coring head frame and lift
cylinder. Locate and retrieve two (2) thrust washers
and two (2) spacers as pin is removed.
C. Rotate lift cylinder toward front of machine.
9. Disconnect wire harness connectors from limit
switches on depth actuator assembly.
10.Remove proximity switch bracket from machine
frame (Fig. 24). Position switch bracket with proximity
switches still attached away from H–frame.
11. Remove right rear wheel from machine (see Wheel
Removal in Service and Repairs section of Chapter 6 –
Chassis). Make sure that machine is supported well with
jackstands or blocking.
CAUTION
ly 650 pounds (294.8 kg). Make sure that proper
repairs.
The coring head assembly weighs approximate-
lift or hoist is used to support coring head during
12.Using suitable lift or hoist, support coring head using
lifting eyelets on coring crankshaft as lift points (Fig. 25).
Once coring head is well supported, remove service
latch from coring head.
13.Remove upper link assemblies from machine frame
and coring head frame.
14.Remove flange nuts (item 15) and carriage screws
(item 13) that secure end of pivot shafts to machine.
15.Carefully slide pivot shafts from H–frame. Locate
and retrieve thrust washers (item 12) from between H–
frame and machine frame.
16.Remove H–frame from machine.
Assembly (Fig. 21)
1. If upper links were disassembled, install rod ends
equally to make link assembly 17.720” to 17.780” (45.0
to 45.2 cm) long (rod center to rod center) (Fig. 26).
IMPORTANT: When installing pivot shaft to H–
frame, make sure that both sides of H–frame are
aligned with holes in machine frame before instal-
ling pivot shaft.
2. Position H–frame to machine frame making sure that
thrust washers are placed between H–frame and ma-
chine frame. Align both sides of H–frame to pivot shaft
holes in machine frame. Slide pivot shaft into H–frame
and machine frame.
3. Position coring head to allow alignment of both sides
of H–frame to pivot shaft holes in coring head frame.
Slide pivot shaft into H–frame and coring head frame.
4. Complete assembly of coring head to machine in the
reverse order of disassembly.
2
1
Figure 25
1. Bearing housing 2. Lifting eyelet
1
2
2
17.720” to 17.780”
(45.0 to 45.2 cm)
Figure 26
1. Upper link 2. Rod end
Coring Head Page 7 – 18 ProCore 648