Caterpillar Performance Handbook, January 2017, SEBD0351-47
Shoe Selection Ground Pressure
Hydraulic Excavators
EXCAVATOR SHOE SELECTION Undercarriage life can be extended by equipping the machine properly for the application. Many excavators work on pavement or flat, soft ground and experience few undercarriage problems. But if those same machines (usually equipped with wide track pads) were placed in severe underfoot condi- tions, undercarriage destruction could occur very rapidly. The rule, used for other track-type machines — “When- ever possible use the narrowest shoes available” — is even more valid for excavators.
The best general purpose track shoe is the triple grouser. It has a good section modulus and offers the best com- promise between traction and minimum disturbance to paved surface. The double grouser shoe has a better section modulus and is more aggressive than the triple grouser section. Single grouser shoes are offered for maximum traction. Some users like single grousers for added mobility in hilly terrain. The following table lists ground pressures for various width shoes (reach boom, medium stick and bucket):
ShoeWidth
Pressure
Model
ShoeType
mm
in
kPa
psi
7
300.9D 301.4C 301.7D
Rubber Belt
180
24.10
7
3.50
Rubber Belt
230
—
9
—
Rubber Belt
230
29.42
9
4.27
301.7D CR
Rubber Belt
230
27.50
9
3.98
302.2D 302.4D
Rubber Belt
250
28.44
10
4.13
Rubber Belt
250
28.44
10
4.13
302.7D CR
Rubber Belt
300 300 300 300 300 350 350 400 400 400 400 450 450 450 600
— —
12 12 12 12 12 14 14 16 16 16 16 18 18 18 24
— —
303E CR
Steel Double Grouser
Rubber Belt
32.20
4.60
303.5E CR/303.5E2 CR
Steel Double Grouser
—
—
Rubber Belt
32.10
4.70
304E CR/304.5E2 XTC
Steel Double Grouser
—
—
Rubber Belt
29.60
4.30
305E2 CR
SteelTriple Grouser
—
—
Rubber Belt
30.50
4.40
305.5E2 CR
SteelTriple Grouser
—
—
Rubber Belt
31.90
4.60
307E2
SteelTriple Grouser SteelTriple Grouser
36.80 36.80 36.80 27.00
5.30 5.30 5.30 3.90
308E2 CR SB/ 308E2VAB
Rubber Belt
SteelTriple Grouser
Edition 47 7-219
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