Shutdown, Bleeder Valve and Wet-Cup

5.Cycle the pump slowly until all air is pushed out and the pump and hoses are fully primed. Release the gun trigger and lock the trigger safety latch. The pump should stall against pressure when the trigger is released.

Do not use your hand or fingers to cover the bleed hole on the underside of the bleeder valve body (AA) when priming the pump. Use a wrench to open and close the bleeder plug (AB). Keep your hands away from the bleed hole.

Operation

If your pump accelerates quickly, or is running too fast, stop it immediately and check the fluid supply.

If the supply container is empty and air has been pumped into the lines, refill the container and prime the pump and the lines with fluid, or flush and leave it filled with a compatible solvent. Be sure to elimi- nate all air from the fluid system.

Shutdown

6.If the pump fails to prime properly, open the bleeder valve plug (AB) slightly. Use the bleed hole as a priming valve until the fluid appears at the hole. See FIG. 3. Close the plug (AB).

When changing fluid containers with the hose and gun already primed, open the bleeder valve plug

(AB), to assist in priming the pump and venting air before it enters the hose. Close the bleeder valve when all air has been eliminated.

7.With the pump and lines primed, and with adequate air or hydraulic pressure and volume supplied, the pump will start and stop as the gun is opened and closed. In a circulating system, the pump will speed up or slow down on demand, until the air or hydrau- lic supply is shut off.

8.Always use the lowest air or hydraulic pressure nec- essary to get the desired results. Higher pressures cause premature tip/nozzle and pump wear.

a.For air-powered pumps, use the air regulator (F) to control the pump speed and fluid pressure.

b.For hydraulic-powered pumps, use the fluid pressure gauge (F) and flow control valve (G) to control the pump speed and the fluid pressure.

9.Never allow the pump to run dry of the fluid being pumped. A dry pump will quickly accelerate to a high speed, possibly damaging itself.

Relieve the pressure, page 12. Stop the pump at the bottom of its stroke to prevent fluid from drying on the exposed displacement rod and damaging the throat packings.

1Bleed hole must face down.

AC	AA 1
	AB

TI8364a

FIG. 3. Bleeder Valve and Wet-Cup

311826B

1800 specifications

The Hitachi 1800 series excavators represent a significant leap in construction and earthmoving technology, designed to enhance productivity while ensuring operator comfort and environmental sustainability. These excavators are emblematic of Hitachi's commitment to advancing machinery engineering, equipped with an array of features and technologies that optimize performance.

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