BENDIX AH-4 Manual - Page 3

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DISASSEMBLY

Rotochamber from Master Cylinder FIGURE 1

1. Remove four cap screws (1), and remove the master

cylinder from the rotochamber.

Rotochamber

1. Remove the Gap screws (2) which hold the rotochamber

head in the shell and remove the head (6), return spring

(7), and spring guide (8).

2. Remove the nuts (3) from the body which secure the

outer clamp (4) to the body. On some units, one of the

mounting brackets is also retained by three of these

nuts.

3. Place body, open end down on bench and tap the ends

of the studs (5) with a brass drift, lead or plastic hammer.

The studs should be tapped on one side of the air inlet

and then the other alternately, to free the outer clamp.

4. Grasp the push rod and, by pulling and wiggling the

entire assembly consisting of push rod and plate,

diaphragm guide, diaphragm, inner and outer clamps

should ease out of the body.

5. Remove the outer clamp.

6. Remove nuts from inside of diaphragm guide.

7. Disassemble the inner diaphragm clamp, diaphragm,

push plate rod assembly, and diaphragm guide.

8. Remove the stroke warning switch from the rotochamber

head and bench test for electrical integrity. If OK, replace

in head.

FIGURE 2

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DISASSEMBLY

Master Cylinder FIGURE 2

1. Clean exterior of master cylinder and drain any

remaining fluid, In the case of remote mounted reservoir,

drain and clean the reservoir.

2. Secure master cylinder in a vise. Depress piston (1)

Fig. 2, at least 1/2 in. and hold. This may be done with

a simple tool as shown in Figs. 3 and 4. Remove the

four self-threading bolts (9) securing the adapter block

or the reservoir to the master cylinder. Remove the

adapter block or reservoir and the compensating valve

(3) and spring (11).

CAUTION The compensating valve must be removed

before any attempt is made to remove the hydraulic

piston assembly (see Fig. 5).

3. Remove retaining ring (8) and stop washer (7).

4. Remove piston holding tool and remove piston (1) and

spring (4).

5. Remove cap nut (10) from adapter block. Remove o-ring

(2) from cap nut and compensating valve seal (5) from

adapter block or reservoir.

3.19 MAX

3.12 REF

STROKE

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