Check Tightening Torque Of Bolts And Nuts - Hitachi ZAXIS 17U-2 Operator's Manual

Check Tightening Torque of Bolts and Nuts

--- every 250 hours (first time after 50 hours)
Tighten or retighten all bolts and nuts to the torque values shown in the Table below. In addition, check bolts and
nuts for looseness and omission. if any are loose or missing, be sure to retighten or supply new parts. Check
tightness after the first 50 hours then every 250 hours.
No. Descriptions
1. Engine cushion rubber mounting bolt
2. Engine bracket mounting bolt (Front)
3. Hydraulic oil tank mounting bolt
Union joints
for hydraulic
4.
hoses and
pipes
5. Pump mounting bolt
6. Pump cover mounting bolt
Control valve mounting bolt
7.
Control valve base mounting bolt
8. Swing device mounting bolt
9. Battery mounting nut
10. Canopy mounting bolt
Swing bearing
11.
mounting bolt
12. Travel device mounting bolt
13. Sprocket mounting bolt
14. Steel crawler guide mounting bolt
15. Lower roller mounting bolt
16. Cover mounting bolt
17. Counterweight mounting bolt
18. Front pin lock plate bolts
IMPORTANT:
•
Before installing, clean the bolt and nut threads to remove soil, rust, and/or dust.
•
When installing new bolts and/or nuts, apply lubricant (e.g. white zinc B solved into spindle oil) to
the screw threads.
•
Tighten bolts and nuts to the specifications. If tightened with excessively high or inadequate torque,
missing or breakage of bolts and/or nut may result.
•
In case the counterweight mounting bolts became loose, consult your nearest Hitachi dealer for
retightening.
MAINTENANCE
Metal face seal
fitting for hydraulic
hoses and piping
Upperstructure
Undercarriage
Bolt Dia.
Q'ty
mm
12 4
10 8
12 4
7/16-20UNF
9/16-18UNF
3/4-16UNF
1-1/16-12UNF
12 2
10 8
10 4
10 4
12 4
6 4
10 3
12 4
10 16
10 18
10 16
10 18
10 8
14 12
6
8
10
20 3
8
10
12
14
16
7-60
Wrench Size
mm
N⋅m
19 88
17 49
19 88
17 24.5
19 29.5
22 39
27 93
36 175
19 88
17 49
17 49
17 49
19 88
10 5
17 49
19 88
17 49
17 49
8 (Socket) 64
8 (Socket) 64
17 49
22 177
10 5
13 9.8
17 49
30 400
13 20
17 49
19 88
22 137
24 205
Torque
(kgf⋅m) (lbf⋅ft)
(9) (65)
(5) (36)
(9) (65)
(2.5) (18)
(3) (22)
(4) (29)
(9.5) (69)
(18) (129)
(9) (65)
(5) (36)
(5) (36)
(5) (36)
(9) (65)
(0.5) (3.5)
(5) (36)
(9) (65)
(5) (36)
(5) (36)
(6.5) (47)
(6.5) (47)
(5) (36)
(18) (130)
(0.5) (3.5)
(1) (7)
(5) (36)
(41) (297)
(2) (14)
(5) (36)
(9) (65)
(14) (101)
(21) (152)