Measuring the Inner Circumference of the Rubber Tracks on Certain Multi-Terrain Loaders {4198} Caterpillar

Multi Terrain Loader

287C (S/N: MAS1-UP)

247 (S/N: CML1-UP)

247B (S/N: MTL1-UP)

257 (S/N: CMM1-UP)

257B (S/N: SLK1-UP)

257D (S/N: EML1-UP; FMR1-UP; D5T1-UP; EZW1-UP)

267 (S/N: CMP1-UP)

267B (S/N: CYC1-UP)

277 (S/N: CNC1-UP)

277B (S/N: MDH1-UP)

277C (S/N: JWF1-UP)

277C2 (S/N: MET1-UP)

277D (S/N: NTL1-UP; FMT1-UP; MLT1-UP)

287 (S/N: CNY1-UP)

287B (S/N: ZSA1-UP)

287C2 (S/N: SSB1-UP)

287D (S/N: STK1-UP; TLK1-UP; HMT1-UP)

297C (S/N: GCP1-UP)

297D (S/N: BE71-UP)

297D XHP (S/N: HP71-UP)

297D2 (S/N: BL71-UP)

297D2 XHP (S/N: HP21-UP)

Introduction

This special instruction provides the procedure for measuring the inner circumference of rubber tracks. Comparison of the actual dimension to the specified dimension will help to ensure a correct fit after installation of the track.

Measuring the Rubber Track

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Illustration 1	g01763819

1. To prepare the rubber track for measuring, lay the track on a firm, flat surface. See Illustration 1.

   Measure the inside surface of the track only. For the 325-8624 Rubber Track, the 278-1215 Rubber Track, and the 278-1219 Rubber Track, measure the side of the track without the outside guide lugs.

   Note: When rubber tracks have been stored outside in cooler temperatures, place the track in a temperature controlled environment for a few hours prior to installation. This step will help facilitate handling of the track.

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   Illustration 2	g01763837

2. Locate a compound joint on the inside surface of the track. Mark this location and label this location with an "X", as shown.

   Note: A compound joint is a seam that can be found on the inside of the rubber track.

   Then, place the "Zero" end of your ruler at the marked location. Make sure that the end of the ruler is flush with your mark. Align the ruler so that the ruler is approximately 1/2 inch from the outside edge of the track. The ruler should remain parallel to the edge of the track. See Illustration 2.

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   Illustration 3	g01763877

3. Hold the ruler in place with your left hand and move to the opposite end of the ruler. Place a mark on the track at the end of the ruler. Label this location with a "1". See Illustration 3.
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   Illustration 4	g01763882

4. Roll the track forward so that you can continue your measurement of the inside surface of the track with your rule. See Illustration 4.

   Note: The previous mark "1" must remain visible for placement of the measuring rule for the next measurement. In addition, the track must be on a flat surface in order to obtain an accurate measurement.

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   Illustration 5	g01763895

5. Move the ruler so that the "Zero" end of the ruler is now flush with the mark "1". Again, align the rule so that the rule is approximately 1/2 inch from the outside edge of the track. The rule should remain parallel to the edge of the track. See Illustration 5.

   Hold the ruler in place with your left hand and move to the opposite end of the ruler. Place a mark on the track at the end of the ruler. Label this location with a "2".

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   Illustration 6	g01763933

6. Repeat the process of marking the track until you are within one length of the ruler from mark "X". See Illustration 6.
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   Illustration 7	g01763955

7. Measure the distance between your last mark and your starting point "X". See Illustration 7.

   Then, add all of the measurements in order to determine the inner circumference. Your measurement should be within 1/8 inch of the factory measurements that are provided in Table 2.

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   Table 2

   Rubber Track	Inner Circumference
   	Nominal Dimension	Tolerance
   325-8624 (1)	4213.9 mm (165.90 inch)	+ 31.75 mm (1.250 inch)	- 19.05 mm (0.750 inch)
   454-6087 (1)
   278-1215 (1)
   420-9876 (1)	4213.9 mm (165.90 inch)	+ 8.9 mm (0.35 inch)	- 18.8 mm (0.74 inch)
   238-7664 (2)	5575.8 mm (219.52 inch)	+ 31.75 mm (1.250 inch)	- 13.21 mm (0.520 inch)
   278-1219 (2)	5575.8 mm (219.52 inch)	+ 31.75 mm (1.250 inch)	- 6.86 mm (0.270 inch)
   420-9878 (2)	5588 mm (220.0 inch)	+ 10.16 mm (0.400 inch)	- 22.225 mm (0.8750 inch)
   325-8625 (3)	5116.8 mm (201.45 inch)	+ 8.9 mm (0.35 inch)	- 31.75 mm (1.250 inch)
   420-9877 (3)	5116.8 mm (201.45 inch)	+ 2.54 mm (0.100 inch)	- 25.4 mm (1.00 inch)
   220-8161 (4)	5077.97 mm (199.920 inch)	+ 8.13 mm (0.320 inch)	- 34.29 mm (1.350 inch)
   420-9879 (4)	5051.4 mm (198.87 inch)	+ 15.875 mm (0.6250 inch)	- 15.875 mm (0.6250 inch)

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   (1)	247, 247B/B2/B3/D, 257, and 257B/B2/B3/D
   (2)	267, 267B, 277, and 277B
   (3)	277C/C2/D, 287C/D, and 297C/D
   (4)	287 and 287B