Hitachi 210313 manual Troubleshooting, Problem Cause Solution

Page 11

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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Contents Model 210313, Series D Instructions Parts ListSymbols Table of ContentsInjection Hazard Fire and Explosion Hazard General Information Grounding InstallationDrain Valve FiltersHydraulic Lines Drip PanKEY Flushing the Pump Pressure Relief ProcedureOperation Check Valve Adjustment Starting and Adjusting the PumpShutdown MaintenanceCorrosion Protection Problem Cause Solution TroubleshootingDisassembly See Fig ServiceDescription Qty PartsNpt outlet Npt inlet 48.1 1220 mm 23.2 585 mm Dimensions Mounting Hole LayoutPump Output Technical DataPump Performance Charts Pump Pressure DevelopedGraco Information Graco Standard Warranty

210313 specifications

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