Hitachi 120-3 class Operator's Manual page 233

Hydraulic excavator
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Metal Face Seal Fittings
Fittings are used on smaller hoses and consist of a metal
flare and a metal flare seat.
1. Inspect flare (10) and flare seat (9). They must be free of
dirt or obvious defects.
IMPORTANT: Defects in the tube flare cannot be repaired.
Overtightening a defective flare fitting will
not stop a leak.
2. Tighten fitting (7) by hand.
3. Tighten fitting (7) or nut (8) to the torque values shown.
Do not allow hose (5) to twist when tightening fittings.
Width across flats
(mm)
N•m
Fastening
torque
(kgf•m)
Pilot Piping Fittings (For shuttle valve)
Width across flats (mm)
Fastening torque
(kgf•m)
17
19
22
24.5
29.5
39
(2.5)
(3)
(4)
17, 19
N•m
34.3
(3.5)
MAINTENANCE
27
78
(8.0)
7-41
7
9
8
10
Shuttle Valve
5
M202-07-051
M1U1-07-043

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