Check Tightening Torque Of Nuts And Bolts; Tightening Torque Chart - Hitachi ZW 310-6 Operator's Manual

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Check Tightening Torque of Nuts and Bolts

--- every 2000 hours (50 hours at first time only)

Check tightness after the first 50 hours then every 2000

Tighten or retighten nuts and bolts to the torque specified

on the following pages.

For the tightening torque of other nuts and bolts used on

this machine, refer to the following table.

(140) (1033) 1050

(195) (1438) 1450

(260) (1918) 1950

(320) (2360) 2450

CAUTION: If counterweight mounting bolts are

loosened, consult your nearest authorized dealer.

 Apply lubricant to bolts and nuts to lower friction

except plated bolts and nuts.

 Remove soil, dust, and/or dirt from the nut and

bolt thread surfaces before tightening.

 Tighten nuts and bolts to specifications. If

tightened with excessively low or high torque,

missing or breakage of nuts and/or bolts may

Tightening torque

N·m (kgf·m) (lbf-ft)

(145) (1069)

(195) (1438)

(245) (1807)

NOTE: Check nuts and bolts for looseness and missing

daily before and after operation. If any loose or missing

nuts and/or bolts are found, retighten or supply

replacement parts.

(0.3~0.4) (2.2~3)