BENDIX SD-03-818 Bedienungsanleitung PDF herunterladen (Seite 6)

DISASSEMBLY (UPPER STATIC PISTON

ASSEMBLY)

1. Remove o-rings (2) and (3).

2. Remove retaining ring (17), and remove secondary

circuit inlet exhaust assembly (1).

DISASSEMBLY OF LOWER STATIC ASSEMBLY

1. Apply ﬁ rm pressure on spring seat (19), which will

compress piston return spring. Locking groove in piston

is now accessible through rectangular opening in lower

static piston body. Insert wire or screwdriver into locking

groove, thus holding static piston spring in compressed

position.

2. Insert blade of screwdriver through relay piston exhaust

passage into slot of stem, and remove lock nut (14),

being careful not to nick the exhaust seat of the relay

piston.

3. Remove spring seat (15), stem spring (23), spring seat

nut (16), rubber spring seat (19), and rubber spring,

(10).

4. Relay piston, relay spring, (5) and stem bolt may now

be removed.

5. Removal of screwdriver or wire from locking groove

will permit spring load to push the primary circuit piston

from the lower static piston. Note: Care should be used

when removing tool from locking ring because of spring

load.

6. Remove o-rings (6 & 7) from relay piston and o-ring,

(9) from primary circuit piston.

7. Remove o-rings (11 & 12) from lower static piston.

8. Remove large retaining ring (20) from lower static

piston, and remove primary circuit inlet/exhaust valve

assembly (4).

DISASSEMBLY-EXHAUST CHECK VALVE

Some E-7

™

brake valves have an air exhaust check valve

(13, 21 & 22) as shown on Figure 2. If so, remove screw

(21), and washer (22), and discard diaphragm (13). Replace

the exhaust check valve diaphragm (13) and secure with

the screw (21) and washer (22).

ASSEMBLY

Note: Before assembly, lubricate all o-rings, bores, and

mating surfaces with silicone lubricant, pc. no. 291126 (Dow

Corning 55-M). Do not lubricate rubber spring.

1. Install secondary circuit inlet-exhaust assembly (1) in

upper static piston, making certain retaining ring (17)

is engaged in groove of upper static piston bore.

2. Install o-rings (2 & 3) on upper static piston and install

in valve body.

3. Install primary circuit inlet-exhaust assembly in lower

static piston making certain retaining ring (20) is

engaged in groove of lower static piston bore.

4. Install three o-rings (2 of 11), and (12) in grooves of

lower static piston assembly. (Note: The larger diameter

o-ring is installed in groove nearest to bottom of piston

assembly.)

5. Install o-rings (6) and (7) on relay piston and o-ring (9)

on primary circuit piston.

6. Carefully clamp primary circuit piston in a soft-jawed

vise taking care not to damage the exhaust seat or the

outside diameter. Assemble the rubber spring, (10) over

the center stem of the center of the piston, then the

spring seat (19) and the spring seat nut (16). Tighten

the spring seat nut until the end of the piston stem and

the spring seat nut are ﬂ ush.

7. Insert relay piston spring (5) and relay piston in top end

of lower static piston, and primary circuit piston spring

(8) and primary circuit piston assembly in the bottom

of lower static piston.

8. Install stem bolt through bore of relay piston, invert

entire lower static piston assembly and position over

a screwdriver mounted in a vise. Engage screwdriver

blade in slot in head of stem.

9. Depress primary circuit piston assembly against spring

until locking groove is accessible through rectangular

hole in side of lower static piston. Engage a screwdriver

or wire in locking groove and release pressure on

piston.

10. Install stem spring, (23), spring seat, (15) and lock nut,

(14). Torque to 20-30 inch Ibs.

11. Install lower static piston assembly in valve body. Install

retainer, (18), making certain locking tabs engage boss

on valve body.

PEDAL ASSEMBLY

Install pedal assembly using three cap screws. On offset

pedal applications, be sure that the cotter pin securing the

fulcrum pin is on the same side of the mounting plate as

the pedal pad. Check to be certain plunger is in contact

with spring seat. The stop button should be adjusted so

that the roller and plunger contact after adjustment, roller

should be able to be turned freely by thumb.

SERVICE CHECKS

OPERATING

Check the delivery pressure of both primary and secondary

circuits using accurate test gauges. Depress the pedal

to several positions between the fully released and fully

applied positions, and check the delivered pressure on the

test gauges to see that it varies proportionately with the

movement of the brake pedal.

1 2 3 4 5 6 7 8

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