Figure 3-155. Oscillating cylinder check valve, removal and installation (sheet 1 of 2).

3-78.

Oscillating

Cylinder

Check

Valve

(1) Inspect housing for cracks or damage,

(2) Inspect shuttle for erosion and wear.

a. General. The purpose of the oscillating

( 3 ) Inspect sleeve and poppet for erosion and

cylinder check valve is to hold the machine stable

wear. Normal operation will show only an ac-

during any type of operation. It also restricts the

c e p t a b l e light line at the point of contact.

flow of oil moving through the oscillating cylinder.

(4) Inspect springs for damage and wear.

Without the check valve, the oscillating cylinder

(5) Check plugs for damaged threads.

would tilt the machine too fast and the operator

d . R e a s s e m b l y . Refer to figure 3-154 (sheet 2 of

would not be able to control the oscillation easily

2 ) and reassemble oscillation cylinder check valve.

and accurately. The oscillating cylinder check valve

(1) Replace O-ring seals. Grease O-rings before

is located on the outside of the main frame directly

i n s t a l l i n g on sleeve and plug.

behind the front oscillation cylinder.

(2) Replace a defective part.

b. Removal. Refer to figure 3-154 (sheet 1 of 1)

e . Installation. Refer to figure 3-154 (sheet 1 of

and remove oscillation cylinder check valve,

2 ) and install oscillation cylinder check valve.

c. Disassembly. Refer to figure 3-154 (sheet 2 of

2) and disassemble oscillation cylinder check valve.

Figure 3-155. Oscillating cylinder check valve, removal and installation (sheet 1 of 2).

KEY to figure 3-155 (sheet 2 of 2):

1 Plug

8 Plug

2 O-ring

9 O-ring

3 Spring

10 Spring

4 Poppet

11 Poppet

5 Sleeve

12 Sleeve

6 O-ring

13 O-ring

7 Shuttle

14 Body

3-222