621F and 627F Wheel Tractor-Scrapers Hydraulic System Caterpillar

Illustration 1	g01029190

(1) Lubricate the threads and torque the nut. ... 1600 ± 160 N·m (1180 ± 118 lb ft)

(2) Bore in the new head ... 70.13 ± 0.03 mm (2.761 ± 0.001 inch)

(3) Diameter of new rod ... 69.800 ± 0.038 mm (2.7480 ± 0.0015 inch)

(4) Diameter of new piston ... 183.65 ± 0.05 mm (7.230 ± 0.002 inch)

(5) Bore in new cylinder ... 184.20 ± 0.10 mm (7.252 ± 0.004 inch)

(6) Lubricate the lip of the seals with the lubricant that is being sealed.

(7) Tighten the head bolts when the rod is fully extended.

(8) Apply 4C-4032 Bearing Mount Compound to the wiper seal groove prior to assembly.