Assemble and Install Spools

HYDRAULIC

E. ASSEMBLY

a. If guide was removed during assembly,

press a new guide in place. Place an O-

NOTE: Prior to reassembly of the valve make certain

ring to groove of seat then install seat in

that bench, tools, and all valve parts are thoroughly

body bore. Place O-ring on plug and

clean and free from dust and foreign matter.

install. Place an O-ring and back-up ring

necessary, thoroughly rewash the parts. Lubricate all

in groove of plunger then install plunger in

parts with hydraulic oil, especially O-rings.

guide. Install spring and follower. Place

an O-ring on cap and install. Install

adjusting screw gasket, jam nut and

1. Assemble and Install Spools

gasket. Temporarily install acorn nut but

do not tighten.

a. Clamp the spool in a soft-jawed vise, then

b. After reassembly of relief valve, do not

position spring retainer, spring and spring

attempt to adjust to the proper setting.

retainer on spool. Compress spring and

Refer to "Relief Valve Adjustment".

install new snap ring. Make certain snap

ring is fully seated in groove, then remove

F. INSTALLATION

spring compressor, Remove spool

assembly from vise.

Use reverse of removal procedure.

Adjust the relief

b. Place O-ring retainer and a new O-ring on

pressure.

spool assembly, then install spool,. Care

should be taken to prevent cutting the O-

G. RELIEF VALVE ADJUSTMENT

ring. With spool fully inserted in valve

body bore, install spool cover and secure

1. Remove the plug from the test port, near the

with screws,

inlet port. (Fig. 7) Connect a 3000 PSI gauge to the

c. Install O-ring, O-ring retainer, wiper and

test port.

retainer plate over eye end of spool and

into position in body. Secure retainer

NOTE: If the valve is not equipped with a test port,

plate with screws and washers,

connect the gauge to the valve inlet port using a tee

fitting.

2. Install Check Valves

2. Remove acorn nut from relief valve. Loosen

a. When installing check valve poppets, and

Jam nut and hold while backing off adjusting screw until

new parts are not used in reassembly,

no tension is felt on relief valve.

make certain that poppets are installed in

their respective bores.

3. With pump running at specified speed and oil at

b. To install, slide poppet in body bore until

operating temperature, operate one spool to a power

fully seated, then insert spring, guide.

position. Turn adjusting screw clockwise until correct

Place a new O-ring on plug and install

pressure setting is obtained.

until plug bottoms.

4. After correct pressure setting has been

3. Install Relief Valve

B-152