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December 2006 |
Measuring Center Tread Idler (CTI) Wear
This IRM covers the procedure to properly measure Center Tread Idler wear for SystemOne? and Rotating Bushing undercarriage on the following machines if available D7R/H, D6R/H, D6N/M, D5N/M, D5H, D4H, D5G/C, D4G, D3G, 963C/B, 953C/B. Wear charts and diagrams for measuring both current and former designs are included in attachments.
Measurement Tools
Center Tread Idler tread wear can be measured with the following tools:
- Small caliper
- Ultrasonic Wear Indicator
Tread Wear Patterns
? Center Tread Idlers generally display either of (2) tread wear patterns, both patterns are normal and acceptable
o A smooth wear surface pattern
o A slightly ?rippled? surface wear pattern
? For the ?rippled? wear pattern, the measurement tool should be located in the bottom of the ?ripple?
Idler Measurements
? The Center Tread Idler must be measured on the machined or notched surface as indicated by dimension ?A? see attachment I.
o The measurement location is very close to the outside edge of the tread surface
? The side of the idler with the part number is either machined around the entire inside diameter or notched.
? If there is uncertainty about which idler side has the machined surface, take a measurement on the inside and outside edge of the idlers and record the smallest measurement.
? If idler is mud packed, scrape mud from (about) a 1-foot length, on the underside of both sides of the idler to determine if the idler has notches or machined surface.
Wear Limits
Center Tread Idler allowable wear and resulting wear limits are based on the rebuildability of the idler. If the idler is worn past 100 percent, the tread will become too thin to successfully rebuild the idler
Wear Charts
Center Tread Idlers wear at a slower rate than conventional idlers. The ?smooth? or ?rippled? wear that occurs on the Center Tread Idler surface is fairly linear with time.
Custom Track Service (CTS)
When performing CTS, refer to the attached wear charts and use the following SystemOne Undercarriage code in CTS 5.5.
|
Machine |
U/C Code |
Idler Part Number |
|
D6R |
C1636 |
255-9197& 227-8717 |
|
D6H |
C1571 |
? |
|
963C/B |
C367 |
228-4231 |
|
D6N |
C1462 |
255-8199 & 227-8829 |
|
D6M |
C1441 |
? |
|
D5H |
C1401 |
? |
|
953C |
C3461 |
228-4230 |
|
953B |
C34601 |
? |
|
D5N |
C1292 |
258-8799 & 228-3712 |
|
D5M |
C1281 |
? |
|
D4H |
C1241 |
? |
|
D5G |
C1356 |
250-0369 |
|
D5C |
C13525 |
? |
|
D4G |
C1192 |
249-7629 |
|
D3G |
C1022 |
? |
TCRobertson
Undercarriage Marketing Division
Marketing and Product Support Division
CV4111-Tel (309) 675-7879
E-mail: Robertson_Thomas@cat.com
Current Design
(Machined Diameter)
Former Design
(Notched)
D7R/H
Center Tread Idlers for Rotating Bushing Track
248-3274
|
Ultrasonic or Caliper |
%Worn |
||
|
In |
mm |
||
|
1.66 |
42.0 |
0 |
|
|
1.64 |
41.5 |
4 |
|
|
1.62 |
41.0 |
8 |
|
|
1.60 |
40.5 |
12 |
|
|
1.58 |
40.0 |
16 |
|
|
1.56 |
39.5 |
19 |
|
|
1.54 |
39.0 |
22 |
|
|
1.52 |
38.5 |
25 |
|
|
1.50 |
38.0 |
28 |
|
|
1.48 |
37.5 |
31 |
|
|
1.46 |
37.0 |
34 |
|
|
1.44 |
36.5 |
37 |
|
|
1.42 |
36.0 |
40 |
|
|
1.40 |
35.5 |
43 |
|
|
1.38 |
35.0 |
46 |
|
|
1.36 |
34.5 |
49 |
|
|
1.34 |
34.0 |
52 |
|
|
1.32 |
33.5 |
55 |
|
|
1.30 |
33.0 |
58 |
|
|
1.28 |
32.5 |
61 |
|
|
1.26 |
32.0 |
64 |
|
|
1.24 |
31.5 |
67 |
|
|
1.22 |
31.0 |
70 |
|
|
1.20 |
30.5 |
73 |
|
|
1.18 |
30.0 |
76 |
|
|
1.16 |
29.5 |
79 |
|
|
1.14 |
29.0 |
82 |
|
|
1.12 |
28.5 |
85 |
|
|
1.10 |
28.0 |
88 |
|
|
1.08 |
27.5 |
91 |
|
|
1.06 |
27.0 |
94 |
|
|
1.04 |
26.5 |
97 |
|
|
1.02 |
26.0 |
100 |
|
|
1.00 |
25.5 |
103 |
|
|
0.98 |
25.0 |
106 |
|
|
0.96 |
24.5 |
109 |
|
|
0.94 |
24.0 |
112 |
|
|
0.92 |
23.5 |
115 |
|
|
0.90 |
23.0 |
118 |
|
|
0.88 |
22.5 |
121 |
|
D6R/H
Center Tread Idlers
255-9197 & 227-8717*
Use this table when idler has machined design (current design)
|
Ultrasonic or Caliper |
%Worn |
||
|
In |
mm |
||
|
1.10 |
28.0 |
0 |
|
|
1.08 |
27.5 |
4 |
|
|
1.06 |
27.0 |
8 |
|
|
1.04 |
26.5 |
12 |
|
|
1.02 |
26.0 |
16 |
|
|
1.00 |
25.5 |
20 |
|
|
0.98 |
25.0 |
24 |
|
|
0.96 |
24.5 |
28 |
|
|
0.94 |
24.0 |
32 |
|
|
0.92 |
23.5 |
36 |
|
|
0.90 |
23.0 |
40 |
|
|
0.88 |
22.5 |
44 |
|
|
0.86 |
22.0 |
48 |
|
|
0.84 |
21.5 |
52 |
|
|
0.82 |
21.0 |
55 |
|
|
0.80 |
20.5 |
58 |
|
|
0.78 |
20.0 |
61 |
|
|
0.76 |
19.5. |
64 |
|
|
0.74 |
19.0 |
67 |
|
|
0.72 |
18.5 |
70 |
|
|
0.70 |
18.0 |
73 |
|
|
0.68 |
17.5 |
76 |
|
|
0.66 |
17.0 |
79 |
|
|
0.64 |
16.5 |
82 |
|
|
0.62 |
15.5 |
85 |
|
|
0.60 |
15.0 |
88 |
|
|
0.58 |
14.5 |
91 |
|
|
0.56 |
14.0 |
94 |
|
|
0.54 |
13.5 |
97 |
|
|
0.52 |
13.0 |
100 |
|
|
0.50 |
12.5 |
103 |
|
|
0.48 |
12.0 |
106 |
|
|
0.46 |
11.5 |
109 |
|
|
0.44 |
11.0 |
112 |
|
|
0.42 |
10.5 |
115 |
|
|
0.40 |
10.0 |
118 |
|
|
0.38 |
9.5 |
121 |
|
*This idler could have a notch design or a machined diameter
design, use this table with the machined diameter only.
D6R/H
Center Tread Idlers
227-8717
Use this table when idler has notch design (former design)
|
Ultrasonic or Caliper |
%Worn |
||
|
In |
mm |
||
|
0.94 |
24.0 |
0 |
|
|
0.92 |
23.5 |
5 |
|
|
0.90 |
23.0 |
10 |
|
|
0.88 |
22.5 |
15 |
|
|
0.86 |
22.0 |
20 |
|
|
0.84 |
21.5 |
25 |
|
|
0.82 |
21.0 |
30 |
|
|
0.80 |
20.5 |
34 |
|
|
0.78 |
20.0 |
37 |
|
|
0.76 |
19.5 |
40 |
|
|
0.74 |
19.0 |
43 |
|
|
0.72 |
18.5 |
46 |
|
|
0.70 |
18.0 |
49 |
|
|
0.68 |
17.5 |
52 |
|
|
0.66 |
17.0 |
55 |
|
|
0.64 |
16.5 |
58 |
|
|
0.62 |
15.5 |
61 |
|
|
0.60 |
15.0 |
64 |
|
|
0.58 |
14.5 |
67 |
|
|
0.56 |
14.0 |
70 |
|
|
0.54 |
13.5 |
73 |
|
|
0.52 |
13.0 |
76 |
|
|
0.50 |
12.5 |
79 |
|
|
0.48 |
12.0 |
82 |
|
|
0.46 |
11.5 |
85 |
|
|
0.44 |
11.0 |
88 |
|
|
0.42 |
10.5 |
91 |
|
|
0.40 |
10.0 |
94 |
|
|
0.38 |
9.5 |
97 |
|
|
0.36 |
9.0 |
100 |
|
|
0.34 |
8.5 |
103 |
|
|
0.32 |
8.0 |
106 |
|
|
0.30 |
7.5 |
109 |
|
|
0.28 |
7.0 |
112 |
|
|
0.26 |
6.5 |
115 |
|
|
0.24 |
6.0 |
118 |
|
|
0.22 |
5.5 |
121 |
|
963C/B
Center Tread Idlers
228-4231
|
Ultrasonic or Caliper |
%Worn |
||
|
In |
mm |
||
|
1.10 |
28.0 |
0 |
|
|
1.08 |
27.5 |
4 |
|
|
1.06 |
27.0 |
8 |
|
|
1.04 |
26.5 |
12 |
|
|
1.02 |
26.0 |
16 |
|
|
1.00 |
25.5 |
20 |
|
|
0.98 |
25.0 |
24 |
|
|
0.96 |
24.5 |
28 |
|
|
0.94 |
24.0 |
32 |
|
|
0.92 |
23.5 |
36 |
|
|
0.90 |
23.0 |
40 |
|
|
0.88 |
22.5 |
44 |
|
|
0.86 |
22.0 |
48 |
|
|
0.84 |
21.5 |
52 |
|
|
0.82 |
21.0 |
55 |
|
|
0.80 |
20.5 |
58 |
|
|
0.78 |
20.0 |
61 |
|
|
0.76 |
19.5. |
64 |
|
|
0.74 |
19.0 |
67 |
|
|
0.72 |
18.5 |
70 |
|
|
0.70 |
18.0 |
73 |
|
|
0.68 |
17.5 |
76 |
|
|
0.66 |
17.0 |
79 |
|
|
0.64 |
16.5 |
82 |
|
|
0.62 |
15.5 |
85 |
|
|
0.60 |
15.0 |
88 |
|
|
0.58 |
14.5 |
91 |
|
|
0.56 |
14.0 |
94 |
|
|
0.54 |
13.5 |
97 |
|
|
0.52 |
13.0 |
100 |
|
|
0.50 |
12.5 |
103 |
|
|
0.48 |
12.0 |
106 |
|
|
0.46 |
11.5 |
109 |
|
|
0.44 |
11.0 |
112 |
|
|
0.42 |
10.5 |
115 |
|
|
0.40 |
10.0 |
118 |
|
|
0.38 |
9.5 |
121 |
|
D6N/M, D5H
Center Tread Idlers
255-8199& 227-8829*
Use this table when idler has machined design (current design)
|
Ultrasonic or Caliper |
%Worn |
||
|
In |
mm |
||
|
1.10 |
28.0 |
0 |
|
|
1.08 |
27.5 |
4 |
|
|
1.06 |
27.0 |
8 |
|
|
1.04 |
26.5 |
12 |
|
|
1.02 |
26.0 |
16 |
|
|
1.00 |
25.5 |
20 |
|
|
0.98 |
25.0 |
24 |
|
|
0.96 |
24.5 |
28 |
|
|
0.94 |
24.0 |
32 |
|
|
0.92 |
23.5 |
36 |
|
|
0.90 |
23.0 |
40 |
|
|
0.88 |
22.5 |
44 |
|
|
0.86 |
22.0 |
48 |
|
|
0.84 |
21.5 |
52 |
|
|
0.82 |
21.0 |
55 |
|
|
0.80 |
20.5 |
58 |
|
|
0.78 |
20.0 |
61 |
|
|
0.76 |
19.5. |
64 |
|
|
0.74 |
19.0 |
67 |
|
|
0.72 |
18.5 |
70 |
|
|
0.70 |
18.0 |
73 |
|
|
0.68 |
17.5 |
76 |
|
|
0.66 |
17.0 |
79 |
|
|
0.64 |
16.5 |
82 |
|
|
0.62 |
15.5 |
85 |
|
|
0.60 |
15.0 |
88 |
|
|
0.58 |
14.5 |
91 |
|
|
0.56 |
14.0 |
94 |
|
|
0.54 |
13.5 |
97 |
|
|
0.52 |
13.0 |
100 |
|
|
0.50 |
12.5 |
103 |
|
|
0.48 |
12.0 |
106 |
|
|
0.46 |
11.5 |
109 |
|
|
0.44 |
11.0 |
112 |
|
|
0.42 |
10.5 |
115 |
|
|
0.40 |
10.0 |
118 |
|
|
0.38 |
9.5 |
121 |
|
* This idler could have a notch design or a machined diameter
design, use this table with the machined diameter only.
D6N/M, D5H
Center Tread Idlers
227-8829
Use this table when idler has notch design (former design)
|
Ultrasonic or Caliper |
%Worn |
||
|
In |
mm |
||
|
0.94 |
24.0 |
0 |
|
|
0.92 |
23.5 |
5 |
|
|
0.90 |
23.0 |
10 |
|
|
0.88 |
22.5 |
15 |
|
|
0.86 |
22.0 |
20 |
|
|
0.84 |
21.5 |
25 |
|
|
0.82 |
21.0 |
30 |
|
|
0.80 |
20.5 |
34 |
|
|
0.78 |
20.0 |
37 |
|
|
0.76 |
19.5 |
40 |
|
|
0.74 |
19.0 |
43 |
|
|
0.72 |
18.5 |
46 |
|
|
0.70 |
18.0 |
49 |
|
|
0.68 |
17.5 |
52 |
|
|
0.66 |
17.0 |
55 |
|
|
0.64 |
16.5 |
58 |
|
|
0.62 |
15.5 |
61 |
|
|
0.60 |
15.0 |
64 |
|
|
0.58 |
14.5 |
67 |
|
|
0.56 |
14.0 |
70 |
|
|
0.54 |
13.5 |
73 |
|
|
0.52 |
13.0 |
76 |
|
|
0.50 |
12.5 |
79 |
|
|
0.48 |
12.0 |
82 |
|
|
0.46 |
11.5 |
85 |
|
|
0.44 |
11.0 |
88 |
|
|
0.42 |
10.5 |
91 |
|
|
0.40 |
10.0 |
94 |
|
|
0.38 |
9.5 |
97 |
|
|
0.36 |
9.0 |
100 |
|
|
0.34 |
8.5 |
103 |
|
|
0.32 |
8.0 |
106 |
|
|
0.30 |
7.5 |
109 |
|
|
0.28 |
7.0 |
112 |
|
|
0.26 |
6.5 |
115 |
|
|
0.24 |
6.0 |
118 |
|
|
0.22 |
5.5 |
121 |
|
953C/B
Center Tread Idlers
228-4230
|
Ultrasonic or Caliper |
%Worn |
||
|
In |
mm |
||
|
1.10 |
28.0 |
0 |
|
|
1.08 |
27.5 |
4 |
|
|
1.06 |
27.0 |
8 |
|
|
1.04 |
26.5 |
12 |
|
|
1.02 |
26.0 |
16 |
|
|
1.00 |
25.5 |
20 |
|
|
0.98 |
25.0 |
24 |
|
|
0.96 |
24.5 |
28 |
|
|
0.94 |
24.0 |
32 |
|
|
0.92 |
23.5 |
36 |
|
|
0.90 |
23.0 |
40 |
|
|
0.88 |
22.5 |
44 |
|
|
0.86 |
22.0 |
48 |
|
|
0.84 |
21.5 |
52 |
|
|
0.82 |
21.0 |
55 |
|
|
0.80 |
20.5 |
58 |
|
|
0.78 |
20.0 |
61 |
|
|
0.76 |
19.5. |
64 |
|
|
0.74 |
19.0 |
67 |
|
|
0.72 |
18.5 |
70 |
|
|
0.70 |
18.0 |
73 |
|
|
0.68 |
17.5 |
76 |
|
|
0.66 |
17.0 |
79 |
|
|
0.64 |
16.5 |
82 |
|
|
0.62 |
15.5 |
85 |
|
|
0.60 |
15.0 |
88 |
|
|
0.58 |
14.5 |
91 |
|
|
0.56 |
14.0 |
94 |
|
|
0.54 |
13.5 |
97 |
|
|
0.52 |
13.0 |
100 |
|
|
0.50 |
12.5 |
103 |
|
|
0.48 |
12.0 |
106 |
|
|
0.46 |
11.5 |
109 |
|
|
0.44 |
11.0 |
112 |
|
|
0.42 |
10.5 |
115 |
|
|
0.40 |
10.0 |
118 |
|
|
0.38 |
9.5 |
121 |
|
D5N/M, D4H
Center Tread Idlers
258-8799 & 228-3712*
Use this table when idler has machined design (current design)
|
Ultrasonic or Caliper |
%Worn |
||
|
In |
mm |
||
|
1.10 |
28.0 |
0 |
|
|
1.08 |
27.5 |
5 |
|
|
1.06 |
27.0 |
10 |
|
|
1.04 |
26.5 |
15 |
|
|
1.02 |
26.0 |
20 |
|
|
1.00 |
25.5 |
25 |
|
|
0.98 |
25.0 |
30 |
|
|
0.96 |
24.5 |
34 |
|
|
0.94 |
24.0 |
37 |
|
|
0.92 |
23.5 |
40 |
|
|
0.90 |
23.0 |
43 |
|
|
0.88 |
22.5 |
46 |
|
|
0.86 |
22.0 |
49 |
|
|
0.84 |
21.5 |
52 |
|
|
0.82 |
21.0 |
55 |
|
|
0.80 |
20.5 |
58 |
|
|
0.78 |
20.0 |
61 |
|
|
0.76 |
19.5. |
64 |
|
|
0.74 |
19.0 |
67 |
|
|
0.72 |
18.5 |
70 |
|
|
0.70 |
18.0 |
73 |
|
|
0.68 |
17.5 |
76 |
|
|
0.66 |
17.0 |
79 |
|
|
0.64 |
16.5 |
82 |
|
|
0.62 |
15.5 |
85 |
|
|
0.60 |
15.0 |
88 |
|
|
0.58 |
14.5 |
91 |
|
|
0.56 |
14.0 |
94 |
|
|
0.54 |
13.5 |
97 |
|
|
0.52 |
13.0 |
100 |
|
|
0.50 |
12.5 |
103 |
|
|
0.48 |
12.0 |
106 |
|
|
0.46 |
11.5 |
109 |
|
|
0.44 |
11.0 |
112 |
|
|
0.42 |
10.5 |
115 |
|
|
0.40 |
10.0 |
118 |
|
|
0.38 |
9.5 |
121 |
|
* This idler could have a notch design or a machined diameter
design, use this table with the machined diameter only.
D5N/M, D4H
SystemOneTM Center Tread Idlers
228-3712
Use this table when idler has notch design (former design)
|
Ultrasonic or Caliper |
%Worn |
||
|
In |
mm |
||
|
0.78 |
20.0 |
0 |
|
|
0.76 |
19.5 |
5 |
|
|
0.74 |
19.0 |
10 |
|
|
0.72 |
18.5 |
15 |
|
|
0.70 |
18.0 |
20 |
|
|
0.68 |
17.5 |
25 |
|
|
0.66 |
17.0 |
30 |
|
|
0.64 |
16.5 |
34 |
|
|
0.62 |
15.5 |
37 |
|
|
0.60 |
15.0 |
40 |
|
|
0.58 |
14.5 |
43 |
|
|
0.56 |
14.0 |
46 |
|
|
0.54 |
13.5 |
49 |
|
|
0.52 |
13.0 |
52 |
|
|
0.50 |
12.5 |
55 |
|
|
0.48 |
12.0 |
58 |
|
|
0.46 |
11.5 |
61 |
|
|
0.44 |
11.0 |
64 |
|
|
0.42 |
10.5 |
67 |
|
|
0.40 |
10.0 |
70 |
|
|
0.38 |
9.5 |
73 |
|
|
0.36 |
9.0 |
76 |
|
|
0.34 |
8.5 |
79 |
|
|
0.32 |
8.0 |
82 |
|
|
0.30 |
7.5 |
85 |
|
|
0.28 |
7.0 |
88 |
|
|
0.26 |
6.5 |
91 |
|
|
0.24 |
6.0 |
94 |
|
|
0.22 |
5.5 |
97 |
|
|
0.20 |
5.0 |
100 |
|
|
0.18 |
4.5 |
103 |
|
|
0.16 |
4.0 |
106 |
|
|
0.14 |
3.5 |
109 |
|
|
0.12 |
3.0 |
112 |
|
|
0.10 |
2.5 |
115 |
|
|
0.08 |
2.0 |
118 |
|
|
0.06 |
1.5 |
121 |
|
D5G/C
SystemOneTM Center Tread Idlers
250-0369
|
Ultrasonic or Caliper |
%Worn |
||
|
Inches |
mm |
||
|
0.98 |
25.0 |
0 |
|
|
0.96 |
24.5 |
5 |
|
|
0.94 |
24.0 |
10 |
|
|
0.92 |
23.5 |
15 |
|
|
0.90 |
23.0 |
20 |
|
|
0.88 |
22.5 |
25 |
|
|
0.86 |
22.0 |
30 |
|
|
0.84 |
21.5 |
34 |
|
|
0.82 |
21.0 |
37 |
|
|
0.80 |
20.5 |
40 |
|
|
0.78 |
20.0 |
43 |
|
|
0.76 |
19.5 |
46 |
|
|
0.74 |
19.0 |
49 |
|
|
0.72 |
18.5 |
52 |
|
|
0.70 |
18.0 |
55 |
|
|
0.68 |
17.5 |
58 |
|
|
0.66 |
17.0 |
61 |
|
|
0.64 |
16.5 |
64 |
|
|
0.62 |
15.5 |
67 |
|
|
0.60 |
15.0 |
70 |
|
|
0.58 |
14.5 |
73 |
|
|
0.56 |
14.0 |
76 |
|
|
0.54 |
13.5 |
79 |
|
|
0.52 |
13.0 |
82 |
|
|
0.50 |
12.5 |
85 |
|
|
0.48 |
12.0 |
88 |
|
|
0.46 |
11.5 |
91 |
|
|
0.44 |
11.0 |
94 |
|
|
0.42 |
10.5 |
97 |
|
|
0.40 |
10.0 |
100 |
|
|
0.38 |
9.5 |
103 |
|
|
0.36 |
9.0 |
106 |
|
|
0.34 |
8.5 |
109 |
|
|
0.32 |
8.0 |
112 |
|
|
0.30 |
7.5 |
115 |
|
|
0.28 |
7.0 |
118 |
|
|
0.26 |
6.5 |
121 |
|
D4G/D3G
SystemOneTM Center Tread Idler
249-7629
|
Depth Gauge |
|
|
|
Inches |
mm |
% Worn |
|
0.98 |
25.0 |
0 |
|
0.96 |
24.5 |
5 |
|
0.94 |
24.0 |
10 |
|
0.92 |
23.5 |
15 |
|
0.90 |
23.0 |
20 |
|
0.88 |
22.5 |
25 |
|
0.86 |
22.0 |
30 |
|
0.84 |
21.5 |
34 |
|
0.82 |
21.0 |
37 |
|
0.80 |
20.5 |
40 |
|
0.78 |
20.0 |
43 |
|
0.76 |
19.5 |
46 |
|
0.74 |
19.0 |
49 |
|
0.72 |
18.5 |
52 |
|
0.70 |
18.0 |
55 |
|
0.68 |
17.5 |
58 |
|
0.66 |
17.0 |
61 |
|
0.64 |
16.5 |
64 |
|
0.62 |
15.5 |
67 |
|
0.60 |
15.0 |
70 |
|
0.58 |
14.5 |
73 |
|
0.56 |
14.0 |
76 |
|
0.54 |
13.5 |
79 |
|
0.52 |
13.0 |
82 |
|
0.50 |
12.5 |
85 |
|
0.48 |
12.0 |
88 |
|
0.46 |
11.5 |
91 |
|
0.44 |
11.0 |
94 |
|
0.42 |
10.5 |
97 |
|
0.40 |
10.0 |
100 |
|
0.38 |
9.5 |
103 |
|
0.36 |
9.0 |
106 |
|
0.34 |
8.5 |
109 |
|
0.32 |
8.0 |
112 |
|
0.30 |
7.5 |
115 |
|
0.28 |
7.0 |
118 |
|
0.26 |
6.5 |
121 |
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