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HYDRAULIC HOSES
The condition of all hoses should be carefully checked during routine service of the
machine. Hoses that have been chaffed or damaged on their outer casing should be
securely wrapped with waterproof adhesive tape to stop the metal braid from rusting.
Hoses that have suffered damage to the metal braid should be changed at the earliest
opportunity.
Hose Replacement
Before changing any hoses take the time to study the existing installation as the routing
has been carefully calculated to prevent hose damage during operation - always replace
hoses in exactly the same location and manner. This is especially important for the flail
hoses where they must be crossed, upper to lower, at the dipper and head pivots.
Always replace one hose at a time to avoid the risk of wrong connections.
When the hose is screwed to an additional fitting or union, use a second spanner on
the union to avoid breaking both seals.
Do not use jointing compound on the threads.
Avoid twisting the hose. Adjust the hose line to ensure freedom from rubbing or
trapping before tightening hose end connections.
Recommended torque settings for nut security (JIC) are as follows:
RECOMMENDED TORQUE
SETTINGS SAE 37° & 45°
- Size
dn
- 4
6
- 5
8
- 6
10
- 8
12
- 10
16
- 12
20
- 16
25
- 20
32
- 24
38
- 32
50
For hose unions (BSP) fitted in conjunction with bonded seals the recommended torque
settings are as follows:
SIZE
1/4" BSP
3/8" BSP
1/2" BSP
5/8" BSP
3/4" BSP
1" BSP
NOTE: 1 Nm. = 1.356 ft.lbs.
Thread Size
7/16"-20
11 Nm (8 ft.lbs.)
1/2"-20
15 Nm (11 ft.lbs.)
9/16"-18
18 Nm (13 ft.lbs.)
35 Nm (26 ft.lbs.)
3/4"-16
45 Nm (33 ft.lbs.)
7/8"-14
70 Nm (52 ft.lbs.)
1.1/16"-12
1.5/16"-12
105 Nm (77 ft.lbs.)
1.5/8"-12
170 Nm (125 ft.lbs.)
1.7/8"-12
215 Nm (159 ft.lbs.)
2.1/2"-12
295 Nm (218 ft.lbs.)
TORQUE SETTING
=
34 Nm
=
75 Nm
=
102 Nm
=
122 Nm
=
183 Nm
=
203 Nm
TORQUE SETTING Nm (ft.lbs.)
Min
125 Nm (92 ft.lbs.)
190 Nm (140 ft.lbs.)
235 Nm (173 ft.lbs.)
325 Nm (240 ft.lbs.)
25 ft.lbs.
or
55 ft.lbs.
or
75 ft.lbs.
or
90 ft.lbs.
or
135 ft.lbs.
or
150 ft.lbs.
or
43
Max
14 Nm (10 ft.lbs.)
18 Nm (13 ft.lbs.)
22 Nm (16 ft.lbs.)
41 Nm (30 ft.lbs.)
55 Nm (41 ft.lbs.)
80 Nm (59 ft.lbs.)
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