Hitachi 231580 manual Drain Valve, Repair, Replacement

Drain Valve

WARNING

INJECTION HAZARD

To reduce the risk of serious injury, whenever you are instructed to relieve pressure, follow the Pressure Relief

Procedure on page 9.

42a	42b		1	Apply thread sealant
		1		Apply grease
		42d	2	to face of base
				Torque into pump
		42c	3	manifold to 185 in±lb
				(21 N.m)
			4	Handle shown
				in closed position
	42			2
3

43

44

4	45
Fig. 28	02819

1.Turn the handle (45) to the closed position. Drive out the pin (44). Remove the handle.

2.Remove the base (43).

3.Unscrew the drain valve (42). The gasket (42a) and seat (42b) will stay in the valve.

Repair

1.Unscrew the spring retainer from the valve body. Remove the spring, washers and stem/ball. Clean any debris from the ball or seat area.

2.If replacing the gasket (42a) or seat (42b), pry out the gasket.

NOTE: Whenever the gasket (42a) is removed, re- place it with a new one.

3.Coat the o-ring (42d) with grease. Press the stem into the valve body. Install the spring, washers and spring retainer into the valve body.

4.Place the seat (42b) in the valve body so the lapped side is toward the ball. Apply a small amount of grease to the new gasket (42a) and install it in the valve body.

NOTE: The gasket will protrude from the end of the valve until the valve is tightened into pump, which correctly seats the gasket.

Replacement

1.Apply a small amount of thread sealant (42e) onto the valve (42) threads. Tighten the valve into the pump manifold to 185 in±lb (21 N.m).

2.Lightly grease the face of the base (43) and install the base. Turn the stem so the pin hole is vertical.

3.Securely install the handle (45) and drive pin (44).

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