TILT CYLINDER REPAIR - TM-10-3930-644-14-P0359

TM 10-3930-644-14&P

6. Remove bearing and packing from piston.

7. Thoroughly check cylinder bore for score marks

or nicks.

These cause damage to piston

packing cups.

D. TILT CYLINDER REPAIR

1. When packing/starts to wear, renew it otherwise

parts of the packing will contaminate the oil and

work into the pump or valve. thus causing

damage, or malfunction.

2. Do not disassemble the unit any more than is

required to replace the faulty packing.

Figure 3.4. Tilt Cylinder Assembly

3. Use only approved packing.

Never make

a. O Rings should be pushed over sharp

substitutions.

edges with care. They can be easily cut.

4. Before installing, inspect for nicks, cuts or flaws.

b. Usually no adjustment is required upon

Do not install if any of these faults are present.

installation; make certain that 0 Rings are

not twisted.

5. All metal surfaces on which packing slides

should be very smooth. If surfaces are scored

c. Check to see that the ring is of correct

or nicked, replace the parts or resurface them.

size to give a "squeeze" in the installed

position.

6. Soak packing in hydraulic oil before installing.

11. Do everything possible to keep all hydraulic

7. Sharp tools or instruments should not be used

parts as clean as possible. Keep dirt and fine

when installing packing.

metal particles from packing and plungers.

Such material can quickly damage packing and

8. When installing seal rings do not stretch them

score plungers.

more than absolutely necessary.

E. TILT CYLINDER REASSEMBLY

9. Fit packing evenly and snugly without using

Reverse disassembly procedure when installing new

undue force.

parts.

10. When packing must be installed over threads or

1. Install new packing and bearing on piston.

sharp edges, use shim stock to protect packing.

2. Install spacers on plunger rod. Be sure that

outer spacer has an 0 Ring in groove.

3. Install piston and plunger assembly in cylinder

tube.

4. Install new nylon pellets, 0 Ring, backup ring,

packing and wiper on packing gland.

5. Install packing gland on plunger assembly and

cylinder tube. Gland must be flush with cuter

edge of cylinder tube.

6. Install yoke on plunger rod same number of

turns as when removed. Tighten capscrew on

yoke.

Figure 3 -3. Tilt; Cylinder Components

3-186