(3) With spring in place, fully tighten the two screws with screw driver.
(4) Place grip support in position, and insert the two upper lock washers and screws. Tighten screws, using screw driver.
(5) Attach valve grip to valve body, using the four lock washers and inserting the four screws through the grip support. Make sure that the yoke shaft of the valve-diaphragm assembly is in front of rocker arm.
d. Maintenance of valve grip. No maintenance is required for the valve grip other than replacement of worn or damaged parts, tightening of screws, cleaning, and lubrication. ([Par 49])
75. BARREL AND VALVE-BODY ASSEMBLY.
a. Description and functioning. ([Fig 47]) This assembly is part of the fuel valve. It includes the barrel, valve body, and operating parts contained in the barrel and valve body. The assembly consists of:
(1) Valve body, an aluminum housing, located at the rear of the gun and mounted on the grip support by means of four screws and lock washers. The valve body has four large threaded openings. The lower opening leads into the valve grip. The side opening, which forms a Y with the main portion of the body, is connected to the fuel-hose assembly. The front opening is screwed on the barrel. The rear opening is closed by the spring retainer and plug.
(2) Valve-diaphragm assembly, which transmits and reverses the movement imparted to it by the rocker arm of the valve grip. ([Par 74 a]) It also serves as a seal, keeping fuel from entering the valve grip. The valve-diaphragm assembly includes:
(a) Yoke shaft, on which the rocker arm bears at the lower end of the shaft.
(b) Yoke, a Y-shaped metal part which fits on the upper end of the yoke shaft and is held to it by a steel pin. The yoke transmits motion from the shaft to the yoke block, and is located within the valve body when the valve is assembled.