Hitachi 210313 manual Troubleshooting, Problem Cause Solution

Troubleshooting

WARNING

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

Before servicing this equipment, always make sure to relieve the pressure.

NOTE: Check all possible problems and solutions before disassembling the pump.

Problem	Cause	Solution
Pump fails to operate	Restricted lines or inadequate hydraulic	Clear lines. Increase hydraulic supply.
	supply
	Insufficient hydraulic pressure; closed	Open; clean.
	or clogged valves, etc.
	Exhausted fluid supply	Refill and reprime, or flush.*
	Clogged fluid line, valves, etc.	Clear.**
	Damaged hydraulic motor	Service the motor. See manual 307158
	Dried fluid seizure of displacement rod.	Clean. See Displacement pump manual
		308043. ALso, keep TSL in the pump
		wet-cup and stop the pump at the bot-
		tom of its stroke during non-use.
Pump operates, but the fluid	Restricted lines, or inadequate hydrau-	Clear lines. Increase hydraulic supply.
output is low on both strokes	lic supply
	Insufficient hydraulic pressure; closed	Open; clean.
	or clogged valves, etc.
	Exhausted fluid supply	Refill and reprime or flush.*
	Clogged fluid line, valves, etc.	Clear.**
	Piston check valve needs adjustment	Adjust. See manual 308043.
	Packing nut too tight	Loosen.
	Loose packing nut or worn throat pack-	Tighten packing nut or replace packings
	ings.	as needed, See manual 308043.
Pump operates, but the output	The intake valve is stuck open or worn.	Clear; service. See manual 308043.
is low on the downstroke
Pump operates, but the output	The piston valve is stuck open, or the	Clear; service. See manual 308043.
is low on the upstroke	packings are worn
Pump is operating erratically,	Exhausted fluid supply	Refill and reprime or flush.*
or speeds up suddenly
	The intake valve is stuck open or worn	Check; replace parts as needed. See
		manual 308043.
	The piston valve is stuck open or the	Check; replace parts as needed. See
	packings are worn.	manual 308043.
	Excessive hydraulic fluid supply volume	Lower volume.
	Air entrained in fluid	Purge all air; change fluid.

*Stop the pump immediately if it is running too fast; check the fluid supply. If empty, refill and reprime the pump being sure to eliminate all air from the system, or flush the pump and store it with an oil-based solvent, such as mineral spirits, to prevent corrosion.

**Relieve the pressure, and then disconnect the fluid line. If the pump starts when the hydraulic power is re- stored, line, etc. is clogged.

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