Forestry and Logging Equipment: Skidding Tractor (Skidder) Caterpillar

Model	Overflow valve pressure
D4H	18615.8 kPa - 2700 lb / sq. inch
545C grapple	20994.5 kPa - 3045 lb / sq. inch
535C grapple	20994.5 kPa - 3045 lb / sq. inch
527	20690 kPa - 3000.8 lb / sq. inch
525C grapple	20994.5 kPa - 3045 lb / sq. inch
518	20684.3 kPa - 3000 lb / sq. inch
515	20684.3 kPa - 3000 lb / sq. inch