Chapter 6 REPAIR INSTRUCTIONS - TM-5-5420-205-140069

TM 5-5420-205-14

CHAPTER 6

REPAIR INSTRUCTIONS

Section I. HYDRAULIC SYSTEM REPAIR

dents, and cracks. Replace parts as required.

6-1. General

(4) Check alignment of piston rod and inspect

a. This section contains repair instructions for the

ends for damage or defective threads.

curbing, rotating, pinning and ramp unfolding cylinder

assemblies, and fabrication of hydraulic line assemblies.

(5) Make sure piston rings are properly installed.

The curbing cylinder piston rings (15, fig. 6-1), the pinning

b. Refer to paragraph 1-8b (5) through (12) for cylinder

cylinder ring (14, fig. 6-3) and the ramp unfold cylinder

tabulated data, and to paragraph 2-2 for purpose and

ring (15, fig. 6-4), are installed with the "UP" side towards

function of the cylinder assemblies.

the rod end of the cylinder. Install the outer ring (11, fig.

6-2. Curbing, Rotating, Pinning, and Ramp Unfolding

6-2) of the rotation cylinder piston with the "UP" side

Cylinder

toward each end of the cylinder.

a. Removal and Installation. Refer to paragraphs

(6) Inspect to determine if ramp and rotation

4-18, 4-19, 4-20, and 4-21 for removal and installation of

cylinder head and cylinder cap have port alinement within 5

the curbing, rotating, pinning, and ramp unfolding cylinders.

degrees.

b. Disassembly and Reassembly. Refer to figure 6-1,

(7) Inspect ramp cylinder female eye bushing. If

6-2, 6-3, and 6-4 for disassembly and reassembly of the

defective, press in new bushing and machine as per

curbing, rotating, pinning, and ramp unfolding cylinders.

specification MIL-T-704, Type B.

c. Inspection and Repair.

(8) Inspect rotation cylinder ball check valves and

(1) Inspect piston and rings for scoring, wear, or

needle valves. Replace defective valves.

chipping. Replace a defective piston or ring.

(9) Inspect rotation cylinder female eye. Replace

(2) Inspect cylinder for abrasion, scoring, dents or

if defective.

cracks. Replace a defective cylinder.

(10) Inspect female eye in rotation cylinder cap.

(3) Inspect rod bushing, cylinder head, cylinder

Replace cap assembly if defective.

cap, and scraper retainer plate for wear, scoring, nicks,

6-1