TM 5-3820-239-15
12 Tower sprocket
1
Nut, hex, 1-8 (2)
1 3 Sprocket yoke
2
Washer, lock 1 in. (2)
1 4 Nut, self-locking hex, 3/4-10
3
Foot piece pointer clamp (2)
15 Washer, lock, 3/4 in.
4
Foot piece clamp bolt (2)
1 6 Nut, jam, 3/4-10
5
Foot piece pinter
17 Lubricating fitting
6
Nut, self-locking hex, 3/4-10
1 8 Sprocket shaft
Washer, flat, 3/4 in.
7
19 Tower sprocket bearing
8
Spring
2 0 Tower sprocket
9
Lubrication fitting
21 Sprocket yoke
10
Sprocket shaft
22 Drill guide
11
Tower sprocket bearimg
Figure 6-8. Air feed motor, valve timing details.
Section III. HYDRAULIC PUMP ASSEMBLY
a. General. Disassemble hydraulic pump as-
This section contain repair instructions for
sembly in the numerical sequence as illustrated
the hydraulic pump assembly. The assembly
consists essentially of an air motor which drives
cedures.
a hydraulic pump through a flexible coupling.
(1) Rotate flexible coupling (14, fig.
The pump provides all of the hydraulic power
6-9) until setscrews (1) are visible.
to drive the hydraulic cylinders, which position
Loosen both setscrews.
the boom and drill guide.
(2) Remove screws (10), nuts (11), and
lock washers (12), and slide hydrau-
6-16. Removal
lic pump (13) out of flexible cou-
pling (14). Remove the flexible cou-
Remove the hydraulic pump assembly as
pling and square key (15).