Figure 2-26. Compressing seals.

CAUTION

4. Place a seal on the expander. Turn the

Under

circumstances

should

c r a n k on the expander until the inside face of the

welding

be done on the wall of the

movable block is slightly past point (A). Then

cylinder except the welded area at the

return to point (A). Rotate the seal 90 on the

head end of the cylinder. Welding on

expander and expand again. Check to see if the seal

the cylinder wall can cause enough bore

will slip off the expander. If not, repeat the

distortion to cause interference between

procedure, expanding the seal farther each time,

t h e piston and the cylinder wall and can

until the seal will slip off the expander when block

result in severe scoring of the cylinder

i s returned to point (A).

wall.

5. Lubricate the outer seals and place

(10) Vane type pumps.

t h e m on the piston. Install and lubricate the wear

(a) Before disassembling a pump, mark the

ring.

pump body and cover to insure correct assembly

6. Select the applicable compressor (1, fig.

w i t h respect to port relationship.

2 - 2 6 ) and install the clamp (2) on the compressor.

P l a c e the compressor loosely over the outer seals

( f i g . 2-26). Place the compressor on the piston so

the rolled side of the compressor will be facing the

cylinder when the piston is installed in the cylinder.

Figure 2-27. Pump cartridge.

Figure 2-26. Compressing seals.

7. Slowly turn the handle on the clamp

and force the seals into their grooves. Be certain the

seals are being settted in their grooves as they are

being compressed.

8. P l a c e t h e p i s t o n a s s e m b l y i n t o t h e

cylinder bore as illustrated; be certain the piston is

s q u a r e in the bore.

9. Drive on the piston rod until the entire

piston assembly is in the cylinder bore. Remove the

clamp and the compressor.

10. Install the bolts securing the cylinder

h e a d to the cylinder with the piston rod fully ex-

tended. Tighten the bolts to the torque value in the

SPECIFICATIONS.

(9) C y l i n d e r i n s t a l l a t i o n . B e f o r e i n s t a l l i n g a

(b) Assemble the vanes (2, fig. 2-27) (and

hydraulic cylinder, apply FED SPEC TT-A-580

inserts (1)) in the rotor (5) and the rotor into the

A n t i - S e i z e Compound to the cylinder pins and pin

ring (4). The sharp edges of the vanes (2) and the

b o r e s to aid in future removal. After the cylinder

arrows (fig. 2-28) on the ring and rotor must point

has been installed, start the engine and operate the

in the direction of PUMP ROTATION when the

c y l i n d e r to remove air from the hydraulic system.

cartridge is installed in the pump cover. Note that

When the system is functioning properly, check the

the passage (A) and passages (C) are angled toward

level of the oil in the hydraulic oil supply tank.

t h e direction of pump rotation.

2-12