Check Tightening Torque Of Bolts And Nuts - Hitachi EX27U Operator's Manual

Check Tightening Torque of Bolts and Nuts

--- every 250 Hours (first time after 50 hours)
Check tightness after the first 50 hours then every 250
hours. Tighten to torque shown if any are loose. Bolts
and nuts should be replaced with those of the same or
higher grade.
For tightening nuts and bolts other then specified in the
table below, refer to the Tightening Torque Chart at the
end of this section.
IMPORTANT: Check and tighten bolts and nuts using
a torque wrench.
EX27u, EX35u
No.
1. Engine cushion rubber mounting bolt
Engine bracket mounting bolt (Front)
2.
Engine bracket mounting bolt (Rear)
3. Hydraulic oil tank mounting bolt
4. Fuel tank mounting bolt
ORS fitting for hydraulic hoses and
5.
piping
6. Pump mounting bolt
7. Pump cover mounting bolt
Control valve mounting bolt
8.
Control valve base mounting bolt
9. Swing device mounting bolt
10. Battery mounting nut
11. Canopy mounting bolt
12. Cab mounting bolt
Swing bearing mounting bolt to up-
perstructure
13.
Swing bearing mounting bolt to un-
dercarriage
14. Travel device mounting bolt
15. Sprocket mounting bolt
16. Upper roller mounting bolt
17. Lower roller mounting bolt
18. Cover mounting bolt
19. Counterweight
20. Front pin-retaining nuts
21. Side-cutter mounting bolts
MAINTENANCE
Descriptions
EX27u
EX35u
EX27u
EX35u
EX27u
EX35u
Bolt Dia. Wrench Size
Q'ty
mm
12 4
10 8
10 6
12 4
10 2
PF 1/8
PF 3/8
PF 1/2
12 2
10 6
10 8
10 4
10 4
14 6
6 2
16 4
16 4
12 24
12 20
12 18/22
12 22
12 18/22
12 22
12 1
14 16
6
8
10
22 2
10
12
14
16
18
14 6
7-66
Torque
mm
N⋅m (kgf⋅m)
19 88 (9)
17 49 (5)
17 49 (5)
19 88 (9)
17 20 (2)
19 29.5 (3)
22 39 (4)
27 64 (6.5)
19 88 (9)
17 49 (5)
17 49 (5)
17 49 (5)
17 49 (5)
22 137 (14)
10 5 (0.5)
24 205 (21)
24 205 (21)
19 108 (11)
19 108 (11)
19 108 (11)
19 128 (13)
19 108 (11)
19 128 (13)
19 88 (9)
22 245 (25)
10 5 (0.5)
13 9.8 (1)
17 49 (5)
32 540 (55)
17 49 (5)
19 88 (9)
22 137 (14)
24 205 (21)
27 390 (40)
22 175 (18)
(lbf⋅ft)
(65)
(36)
(36)
(65)
(15)
(22)
(29)
(47)
(65)
(36)
(36)
(36)
(36)
(101)
(3.5)
(152)
(152)
(80)
(80)
(80)
(94)
(80)
(94)
(65)
(181)
(3.5)
(7)
(36)
(398)
(36)
(65)
(101)
(152)
(290)
(130)