Hitachi 222104 important safety instructions Troubleshooting, Problem Cause Solution

Troubleshooting

Problem

Cause

Solution

Pump does not run.	There is no fluid demand.	In a closed-end system the pump runs only when
		there is demand for fluid.
	Air supply is insufficient.	Check air supply. Increase air pressure or volume.
	Fluid outlet line or intake valve is	Relieve the pressure. Check and clear obstructions.
	clogged.
	Air motor parts are worn or	Check the piston o-rings (15a*, 15b*) and exhaust
	damaged.	plate (15c*) for swelling. Replace if necessary. See
		page 10.
		Check the piston assembly (15). Be sure its screws
		are properly torqued (10 to 14 in-lb [1.3 to 1.6 N-m])
		and that the assembly is hand-tightened onto the
		piston rod.
		Check the springs (8, 17) for wear or damage, and
		replace as needed.
Pump speeds up or runs	Material viscosity is too high.	Reduce viscosity. Reduce pump speed when running
erratically.		viscous materials.
	Pump throat packings, piston or	Relieve the pressure. Check and repair. See pages
	piston packings, or intake valve is	10 and 11.
	worn.
Pump slows down or runs	Air motor is icing.	Shut off pump and allow to warm up. Run pump at a
erratically.		lower air pressure.
Pump runs, but output is low on	Pump piston and/or intake valve is	Relieve the pressure. Check and repair. See pages
up or down stroke.	worn.	10 and 11.
Pump runs, but output is low on	Air supply is insufficient.	Check air supply. Increase air pressure or volume.
both strokes.
	Fluid outlet line, intake valve, or	Relieve the pressure. Check and clear obstructions.
	dispense valve is clogged.

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 8.

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