User manual BENDIX E-7 DUAL BRAKE VALVE

[. . . ] A warranty may be voided if intrusive maintenance is performed during the warranty period. No two vehicles operate under identical conditions, as a result, maintenance intervals may vary. Experience is a valuable guide in determining the best maintenance interval for air brake system components. At a minimum, the E-7TM valve should be inspected every 6 months or 1500 operating hours, whichever comes first, for proper operation. [. . . ] 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. Remove o-rings (6 & 7) from relay piston and o-ring, (9) from primary circuit piston. Remove o-rings (11 & 12) from lower static piston. Remove large retaining ring (20) from lower static piston, and remove primary circuit inlet/exhaust valve assembly (4). REMOVAL (IF NECESSARY) 1. Block the wheels or hold the vehicle by means other than air brakes and exhaust air pressure from reservoirs supplying air to the E-7TM valve. In most installations, the E-7 internal parts may be removed and replaced by removing the three cap screws which hold the pedal assembly in place and removing the pedal assembly. The internal parts may then be removed from the E-7TM as described in disassembly. If necessary to remove the E-7 TM from the engine compartment bulkhead, identify the two supply and two delivery lines to their respective ports as connected to the brake valve. There may also be air lines to other brake devices inside the cab, which should be properly identified before disconnecting. In the case of a manifold type installation, the three cap screws which hold the manifold to the brake valve may be removed and the brake valve removed. TM DISASSEMBLY-EXHAUST CHECK VALVE Some E-7TM 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 (21) and (22) using new diaphragm (13). ASSEMBLY Note: Before assembly, lubricate all o-rings, bores, and mating surfaces with silicone lubricant, pc. 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. Install o-rings (2 & 3) on upper static piston and install in valve body. Install primary circuit inlet-exhaust assembly in lower static piston making certain retaining ring (20) is engaged in groove of lower static piston bore. 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. 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 flush. DISASSEMBLY (REFER TO FIGURE 2) 1. [. . . ] Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted. Use only genuine Bendix ® replacement parts, components and kits. Replacement hardware, tubing, hose, fittings, etc. [. . . ]