Accumulator Charging Kit Instructions

011-562-800 G

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Publication information

© 2005 MTS Systems Corporation. All rights reserved. MTS is a registered trademark of MTS Systems Corporation. MTS Systems Corporation 14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone: 952-937-4000 (outside the U.S. or Canada) Fax: 952-937-4515 E-mail: [email protected] http://www.mts.com

Manual Part Number

Publication Date

011-562-800 G

July 2005

Using the Accumulator Charging Kit The Accumulator Charging Kit is used to check and, if necessary, adjust the nitrogen precharge pressure of most piston and bladder type accumulators. The procedures below are general procedures. If more detailed information is required, refer to the Series 111 Accumulator product manual or the Procedure for Checking Piston and Bladder Type Accumulator Precharge and Precharging (MTS part number 408266-01). Low Pressure Gage 0-300 psi (0-2.1 MPa)

Open

Open

Close

Gage Protector (factory set to limit pressure to the gage to approximately 200 psi (1.4 MPa)

r

Valve Stem

Locknut

High Pressure Gage 0-3000 psi (0-21 MPa)

Chuck Valve Poppet Type Valve To Open and Close Use Locknut

Accumulator Charging Kit

Close OR

Extension Hose

Input Check Valve Bleed Valve

THESE ITEMS SUPPLIED BY USER Regulator Output Pressure Valve

Nitrogen Bottle Valve

Regulator Shut-Off Valve

Valve Core Valve Stem

Nitrogen Bottle

Nitrogen Supply Hose

Checking the precharge pressure

Regulator Output Pressure Gage

Close

Open

Core Type Valve To Open and Close Use Chuck Valve

Nitrogen Bottle Pressure Gage

1. Turn off system electrical and hydraulic power. Ensure that system hydraulic pressure is at zero. 2. Close the bleed valve. 3. Turn the chuck valve fully counterclockwise. 4. Connect the chuck valve to the accumulator valve. 5. Open the accumulator valve (note the two types of accumulator valves on the parts identification illustration). 6. Read the accumulator pressure on the appropriate pressure gage. If pressure is other than the required level, proceed with Reducing Precharge Pressure or Increasing Precharge Pressure as applicable. If the pressure is at the required level, close the accumulator valve and remove the chuck valve.

Accumulator Charging Kit Instructions

Using the Accumulator Charging Kit

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Reducing the precharge pressure

1. Slowly open the bleed valve until gas begins to escape. 2. When the pressure reaches the required level, close the bleed valve completely. 3. Close the accumulator valve and remove the chuck valve.

WARNING

Use only dry nitrogen to charge accumulators. Damage to equipment or injury to personnel can result from use of another gas. Use dry nitrogen to charge accumulators when you perform the following steps.

Increasing the precharge pressure

1. Close the accumulator valve. 2. Connect the nitrogen supply hose assembly. 3. Adjust the regulator output pressure to the required level. 4. Open the accumulator valve. 5. Slowly open the regulator shutoff. 6. Charge the accumulator to the required level. 7. Close the regulator shutoff valve. 8. Close the accumulator valve. 9. Open the bleed valve, then remove the chuck valve.

Pressure check intervals

It is normal for a small amount of accumulator precharge loss to occur during operation. Because of this gradual reduction in precharge pressure, the pressure should be checked and recharged (if necessary) at regular intervals. The precharge pressure checking intervals of your accumulators depends on how your system is used. Vigorous use causes more rapid pressure loss and thus requires checking and recharging more often. Initially, check the accumulator precharge pressure every 2 weeks or 100 operating hours. If the precharge pressure changes more than 1.38 MPa (200 psi) during this time period, recharge the accumulator and check the pressure twice as often in the future. If the precharge pressure changes less than 1.38 MPa (200 psi), check the pressure half as often. When you have established a regular interval for checking the precharge pressure, note the amount of pressure loss that occurs each time the pressure is checked. An increase in pressure loss during the period between checks may indicate that the accumulator seals require replacement.

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Using the Accumulator Charging Kit

Accumulator Charging Kit Instructions

Accumulator Charging Kit (Part Number 376986-01) Part Description

MTS Part Number

Quantity

Tank valve

100982-05

1

Bleed valve

100982-49

1

Manifold

113451-08

1

Pressure gage (0-3000 psi)

113451-08

1

Pressure gage (0-300 psi)

428414-01

1

Pressure limiting valve

118618-01

1

Steel pipe nipple 1/4 in MPT

100263-03

1

Extension hose assembly

419227-01

1

Coupling 1/8 in FPT

100244-01

1

Chuck valve

100982-48

1

419228-01

1

Flat copper washer

100999-01

10

valve core

100982-02

4

valve repair tool

100983-03

1

valve stem extension

100983-01

1

hard fiber washer

114802-02

4

426693-01

1

Gage and Extension Hose Assembly

Nitrogen supply hose Servicing accessories

Carrying case

Accumulator Charging Kit Instructions

Using the Accumulator Charging Kit

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Using the Accumulator Charging Kit

Accumulator Charging Kit Instructions

m MTS Systems Corporation 14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone: 952-937-4000 (outside the U.S. or Canada) Fax: 952-937-4515 E-mail: [email protected] http://www.mts.com ISO 9001:2000 Certified QMS