Caterpillar Performance Handbook, January 2017, SEBD0351-47

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Edition 47 32-61
Tires Standard Cold Inflation Pressures
● WheelTractor-Scrapers — Bias and Radial Ply
WHEELTRACTOR-SCRAPERS — Bias Ply
Model Tire Size
Ply
Rating
Inflation Pressure
Titan Yokohama
Front Rear Front Rear
kPa psi kPa psi kPa psi kPa psi
621H 33.25-29 38 400 58 400 58
621K 33.25-29 38 414 60 345 50
623K 33.25-29 38 414 60 345 50
657G 37.5-39 52 448 65 448 65
WHEELTRACTOR-SCRAPERS — Radial Ply
Model Tire Size
Star
Rating
Inflation Pressure
Michelin Bridgestone/Firestone
Front Rear Front Rear
kPa psi kPa psi kPa psi kPa psi
621H 33.25R29 ★★ 448 65 393 57
621K 33.25R29 ★★ 448 65 400 58 462 67 434 63
623K 33.25R29 ★★ 448 65 414 60 462 67 434 63
627K 33.25R29 ★★ 476 69 476 69 483 70 483 70
631G 37.25R35 ★★ 552 80 476 69 552 80 552 80
631K 37.25R35 ★★ 552 80 476 69 552 80 552 80
637G 37.25R35 ★★ 552 80 503 73 552 80 552 80
637K 37.25R35 ★★ 552 80 503 73 552 80 552 80
657G 40.5/75R39 ★★ 600 87 524 76 621 90 621 90
Optimal pressures may vary depending on specific applications and working conditions. Always consult your local tire supplier for operating pressures.