MAINTENANCE
7-119
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
hours.
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.
Tightening Torque Chart
Bolt Dia.
mm (in)
Tightening torque
N·m (kgf·m) (lbf-ft)
Wrench size
mm
Hexagon
Bolt
(8~11T)
Flanged
Bolt
(8T)
Socket Bolt
(11T) (8T) (4T)
6 (0.24) 3~4 (0.3~0.4) (2.2~3) 10 10 5
8 (0.31) 30 (3) (22) 20 (2) (14.8) 10 (1) (7.4) 13 12 6
10 (0.39) 65 (6.5) (48) 50 (5) (36.9) 20 (2) (14.8) 17 14 8
12 (0.47) 110 (11) (81) 90 (9) (66.4) 35 (3.5) (25.8) 19 17 10
14 (0.55) 180 (18) (133) 140 (14) (104) 55 (5.5) (40.6) 22 12
16 (0.63) 270 (27) (199) 210 (21) (155) 80 (8) (59) 24 22 14
18 (0.71) 400 (40) (295) 300 (30) (221) 120 (12) (88.5) 27 14
20 (0.79) 550 (55) (406) 400 (40) (295) 170 (17) (125) 30 27 17
22 (0.87) 750 (75) (553) 550 (55) (406) 220 (22) (162) 32
24 (0.94) 950 (95) (700) 700 (70) (516) 280 (28) (207) 36 32 19
27 (1.06) 1400 (140) (1033) 1050 (105) (774) 400 (40) (295) 41
30 (1.18) 1950 (195) (1438) 1450 (145) (1069) 550 (55) (406) 46
33 (1.30) 2600 (260) (1918) 1950 (195) (1438) 750 (75) (553) 50
36 (1.42) 3200 (320) (2360) 2450 (245) (1807) 950 (95) (700) 55
d
CAUTION: If counterweight mounting bolts are
loosened, consult your nearest authorized dealer.
IMPORTANT:
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
result.
f
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.
To Next Page
Loading...
Need help?
General
