Procedure to Adjust Track Tension on Variable Gauge Undercarriages {4157, 4158} Caterpillar

Mobile Hydraulic Power Unit

323D MHPU (S/N: DCY1-UP)

323D MHPU L (S/N: L5Z1-UP)

323D MHPU LN (S/N: DCJ1-UP)

324D MHPU (S/N: F661-UP)

324D MHPU LN (S/N: M4A1-UP; KJR1-UP)

325D MHPU L (S/N: SRC1-UP; C3N1-UP; H3N1-UP; X3N1-UP)

329D MHPU L (S/N: J8D1-UP; J9D1-UP; L5G1-UP; L5H1-UP)

329E MHPU (S/N: K2L1-UP; KNR1-UP)

330D MHPU L (S/N: D3D1-UP; H3D1-UP; M3D1-UP)

336D MHPU L (S/N: J6D1-UP; JRX1-UP; L5X1-UP)

336E MHPU L (S/N: T3Z1-UP)

340D2 MHPU L (S/N: DC81-UP)

345C MHPU L (S/N: NRF1-UP; B6N1-UP)

345D MHPU (S/N: P5D1-UP; L5R1-UP)

349D MHPU L (S/N: DKN1-UP; MCX1-UP)

349E MHPU (S/N: S3P1-UP)

365C MHPU (S/N: GSZ1-UP)

374D MHPU L (S/N: JNZ1-UP)

385C MHPU (S/N: MSF1-UP)

390D MHPU L (S/N: M1M1-UP)

Undercarriage

UNDERCARRIAGE (S/N: DSL1-UP; D1M1-UP)

Introduction

This Special Instruction describes the procedure to adjust the track tension on (VH) style and l (VM) style undercarriages. Do not attempt any procedure in this Special Instruction until you have read the information and you understand the information.

Safety

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Personal injury or death can result from grease under pressure. Grease coming out of the relief valve under pressure can penetrate the body causing injury or death. Do not watch the relief valve to see if grease is escaping. Watch the track or track adjustment cylinder to see if the track is being loosened. Loosen the relief valve one turn only. If track does not loosen, close the relief valve and contact your Caterpillar dealer.

Tooling

Illustration 1	g03835352
(A) Tooling (A)

Illustration 2	g03835396
(B) Tooling (B)

Specifications

Adjustment Procedure

1. Park machine on hard, level surface.
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   Illustration 3	g02157981
   (A) Tooling

2. Lift the track frame from the ground and support carbody with tooling (A) or suitable stands or cribbing.
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   Illustration 4	g03834975

3. Find the center track roller. Measure the clearance between the top of the track chain link and the bottom surface of the track roller where the link rides. Refer to "Specifications" for the correct dimension for your undercarriage model.
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   Illustration 5	g03834978
   (1) Injection valve

4. Add grease through injection valve (1) to reduce clearance between track roller and track link. Loosen injection valve (1) to increase clearance between track roller and track link.

Note: If machine cannot be raised off the ground to check clearance between track roller and the track link, install tooling (B) to injection valve (1) and pressurize track adjuster to the correct pressure. Refer to "Specifications" for the correct pressure value for your undercarriage model.