Nitrogen Pressure Test Unit FT2724 {4150, 4159, 4169, 4170, 4171, 4174, 4175, 4180} Caterpillar

Caterpillar Products

Machines with Grease Lubricated Track with Swage

Machines with Greased Lubricated Track (GLT)

Machines with Positive Pin Retention (PPR) Track

Machines with Positive Pin Retention 2 (PPR2) Track

Machines with Rotating Bushing Track

Machines with Sealed Positive Pin Retention (PPR) Track

Machines with Sealed Track

Machines with Sleeve Bearing Track

Machines with SystemOne Undercarriage

Machines with non-PPR Sealed and Lubricated Track

Track Drills

MD5150C (S/N: SEY1-UP)

Track-Type Tractor

All

Introduction

© 2019 Caterpillar All Rights Reserved. This guideline is for the use of Cat dealers only. Unauthorized use of this document or the proprietary processes therein without permission may be violation of intellectual property law. Information contained in this document is considered Caterpillar: Confidential Yellow.

This Undercarriage Reconditioning Bulletincontains the necessary information to allow a dealer to establish a parts reusability program. Reuse and salvage information enables Cat dealers and customers to benefit from cost reductions. Every effort has been made to provide the most current information that is known to Caterpillar. Continuing improvement and advancement of product design might have caused changes to your product which are not included in this publication. This Undercarriage Reconditioning Bulletin must be used with the latest technical information that is available from Caterpillar.

For technical questions when using this document, work with your Dealer Technical Communicator (TC).

To report suspected errors, inaccuracies, or suggestions regarding the document, submit a form for feedback in the Service Information System (SIS Web) interface.

Summary

The test serves as a quality gate to ensure component joint integrity and improve product performance on track rollers and track idlers

References

• Reconditioning Bulletin, SEBF8574, "Track Roller Oil Fill Volume {0645, 4180, 7500, 7579}"

• Reconditioning Bulletin, SEBF8575, "Carrier Roller Oil Fill Volume {4154}"

• Reconditioning Bulletin, SEBF8576, "Idler Oil Fill Volume {4159, 4159}"

• Reconditioning Bulletin, SEBF8577, "Oil Volumes for Track Link Assemblies {4169}"

Safety

Illustration 1	g02139237

Most accidents that involve product operation, maintenance, and repair are caused by failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing potentially hazardous situations before an accident occurs. A person must be alert to potential hazards. This person should also have the necessary training, skills, and tools to perform these functions properly.

This bulletin may contain hazardous steps. A safety alert symbol like the one below is used to indicate a hazard.

Warning messages identify a specific, imminent, latent, hazard that has a reasonable probability of resulting in personal injury or death if the warning is ignored.

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Do not attempt to disassemble or assemble this machine until you read and understand the disassembly and assembly instructions. Improper disassembly and assembly procedures could result in injury or death.

Canceled Part Numbers and Replaced Part Numbers

This document does not include all canceled part number and replaced part number information. Use NPR on SIS for information about canceled part numbers and replaced part numbers. NPR will provide the current part numbers for replaced parts.

Features & Benefits

Machine problems must be found during scheduled maintenance, before a costly failure in the field, causing customer dissatisfaction. The goal of every undercarriage service shop is to provide reliable undercarriage service. Caterpillar is committed to providing undercarriage service shops with the tools needed for a high quality and efficient undercarriage service shop. The nitrogen pressure test gives the undercarriage service shop a distinct advantage.

Testing at the technical center in Mossville, Illinois has concluded that nitrogen pressure tests are reliably accurate compared to traditional vacuum tests. A vacuum value pulled at one location will be different from a value pulled at another location. The difference will be due to changes in elevation and barometric pressure. Another item that makes the vacuum method unreliable and obsolete is the introduction of contaminates (particles and water) found in shop air. In conclusion, the test results showed that nitrogen pressure testing is more accurate than traditional vacuum testing.

Repair Process Engineering no longer supports vacuum testing of undercarriage components.

Note: Contamination can cause a good component joint to fail. The use of nitrogen instead of shop air will ensure that clean gas enters the cavity. Unless the shop air is filtered and ran through a dryer, the air will contain harmful particles and water. Untreated air can cause premature component joint failure.

Tooling and Equipment

Illustration 2	g02085483
Nitrogen tank and cart, regulator, pressure test tool FT2724

Illustration 3	g02722068
FT2724 components (1) 8T-0831 Lubricator tip (2) 4C-7099 Reducer fitting (3) 170-5665 Pressure tester (Pressure differential valve) (4) 5P-8998 Pipe fitting (5) 006-0210 Pipe tee (6) 8T-0848 Pressure gauge (7) 4C-7090 Ball valve

Set-up

Illustration 4	g03341572
Close pressure differential valve

1. Close the pressure differential valve (A) by turning the knob clockwise (CW) .

Illustration 5	g03341588
Open nitrogen cylinder

2. Open the nitrogen cylinder (B) by turning the knob counterclockwise (CCW) .

Illustration 6	g03341591
Open ball valve

3. Turn the ball valve handle (C) to the on position.

Illustration 7	g03341592
Adjust the regulator

4. Adjust the regulator at the nitrogen cylinder (B) until the 8T-0848 pressure gauge reaches 138 kPa (20 psi).

Illustration 8	g02442942
Close the ball valve

5. Turn the ball valve handle to the off position.

Test Cycle

Illustration 9	g02443016
Insert lubricator tip

1. Insert the lubricator tip into the stopper.

Illustration 10	g03341593
Open the ball valve

2. Turn the ball valve handle (C) to the on position.

Illustration 11	g03341595
Open the pressure differential valve

3. Open the pressure differential valve (A) by turning the knob (CCW) .

Illustration 12	g02444522
Observe the gauges

4. The pressure differential valve gauge needs to read zero and the nitrogen pressure gauge should be at 138 kPa (20 psi).

Note: An adjustment of the nitrogen pressure may be needed to reach 138 kPa (20 psi)

Illustration 13	g03341596
Close the ball valve

5. Turn the ball valve (C) handle to the off position.

Illustration 14	g03341597
Close the pressure differential valve and begin the count

6. Begin a 10 second count upon closing the pressure differential valve (A) knob. Turn the knob (CW) to close.

Illustration 15	g02444637
Observe the pressure differential valve gauge

7. Watch the pressure differential valve gauge needle for the 10 second time period.

• A pressure drop of 2.5 percent or less than 3.5 kPa (0.5 psi) is acceptable. The component has passed leak test.

• A pressure drop greater than 2.5 percent 3.5 kPa (0.5 psi) is not acceptable. The component has failed leak test.

Correction of Failure

Follow the steps below for a component that fails leak test.

1. Disassemble the component.

2. Determine the cause of failure and correct the issue.

3. Perform pressure test on the repaired component to make sure that the item passes testing. Use the steps provided in this document. Refer to the section ""Test Cycle" ".