Service Manual

ProCore 864/1298 Page 4 − 35 Coring Head
Disassembly (Fig. 34)
1. Remove flange head screw (item 1), flat washer
(item 2) and depth control gage (item 3) from top of
depth control shaft.
2. Remove hairpin clip (item 9) and shoe (item 8) from
bottom of depth control shaft.
3. Unscrew depth control shaft (item 10) and remove
from depth control hub.
4. Remove upper and lower oil seals (items 4 and 7)
from depth control hub. Take care to not damage seal
bores in hub. Discard seals.
5. Remove six (6) flange head screws (item 23) that se-
cure lock plate and cover to depth control hub. Remove
lock plate, cover and gasket.
6. Slide adjustment shaft assembly from depth control
hub. Remove flange bushings (item 11), thrust washers
(item 13), thrust bearings (item 12), worm (item 14), key
(item 24) and worm gear spacer (item 15) from adjust-
ment shaft.
7. Remove plain washer (item 19) from depth control
hub.
8. Slide worm gear (item 18) with two (2) bearing wash-
ers (item 16) and thrust bearing (item 17) from depth
control hub. Remove bearing washers and thrust bear-
ing from worm gear flange.
9. Clean and inspect all components. Replace all com-
ponents that are worn or damaged.
Assembly (Fig. 34)
1. Apply grease to depth control components:
A. Pack thrust bearings (items 12 and 17) 60% to
100% full with grease.
B. Fill all threads of depth control shaft (item 10)
60% to 100% full with grease.
C. Fill all gear teeth voids of worm (item 14) and
worm gear (item 18) 60% to 100% full with grease.
2. Place bearing washer (item 16), greased thrust bear-
ing (item 17) and then second bearing washer onto
flange of greased worm gear (item 18).
3. Position worm gear assembly into depth control hub.
Slide plain washer (item 19) between worm gear and
control hub.
4. Place inner flange bushing (item 11) into depth con-
trol hub.
5. Install components onto adjustment shaft (item 25):
A. Slide outer flange bushing (item 11), worm gear
spacer (item 15), thrust washer (item 13), greased
thrust bearing (item 12) and second thrust washer
onto shaft.
B. Place key (item 24) into shaft slot, align worm
(item 14) with key and then slide greased worm onto
shaft.
C. Place thrust washer (item 13), greased thrust
bearing (item 12) and final thrust washer onto shaft.
6. Slide assembled adjustment shaft into inner flange
bushing in depth control hub. Make sure that inner
flange bushing is still properly positioned in hub bore.
7. Place gasket (item 20) and cover (item 21) onto
depth control hub. Make sure that outer flange bushing
(item 11) is properly positioned into cover bore. Install
four (4) flange head screws that surround adjustment
shaft. Do not fully tighten screws at this time.
8. Lightly oil upper and lower oil seals. Install seals into
depth control hub taking care to not damage seals dur-
ing installation.
9. Insert greased depth control shaft (item 10) into bot-
tom of depth control hub and thread shaft into worm
gear. Take care to not damage seals during depth con-
trol shaft installation.
10.Position lock plate (item 22) to cover and secure with
two (2) flange head screws. Fully tighten all six (6) cover
screws.
11.Place shoe (item 8) on bottom of depth control shaft
and secure with hairpin clip.
12.Position depth control gage (item 3) to top of depth
control shaft and align slot in gage with tab on shaft. Se-
cure gage to control shaft with flat washer and flange
head screw.
Coring Head