McConnel PA7070T Operator's Manual page 56

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
 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.
Before changing hoses study the installation, these are carefully calculated to prevent
hose damage during operation. Always replace hoses in exactly the same manner. This is
especially important for the flail hoses where they must be crossed, upper to lower, at the
dipper and head pivots.
All Hydraulic Hoses (BSP) now fitted to McConnel Power Arm Hedge/Grass Cutters have
'Soft Seal' connections on both flail and ram circuit hoses.
Recommended torque settings for nut security are as follows:-
1/4" BSP
3/8" BSP
1/2" BSP
5/8" BSP
3/4" BSP
1" BSP
For hose unions (BSP) fitted in conjunction with bonded seals the recommended torque
settings are as follows:-
1/4" BSP
3/8" BSP
1/2" BSP
5/8" BSP
3/4" BSP
1" BSP
Safety Note
Soft Seal hose connections are capable of holding pressure when the nut is only 'finger
tight'; it is therefore recommended that during dismantling, the hose be manually flexed to
relieve any residual pressure with the retaining nut slackened, prior to the completing
disassembly.
= 24 Nm or
= 33 Nm or
= 44 Nm or
= 58 Nm or
= 84 Nm or
= 115 Nm or
= 34 Nm or
= 75 Nm or
= 102 Nm or
= 122 Nm or
= 183 Nm or
= 203 Nm or
40
REF.'O' ring
l8 lb ft 10 000 01
24 lb ft 10 000 02
35 lb ft 10 000 03
43 lb ft 10 000 04
62 lb ft 10 000 05
85 lb ft 10 000 06
25 lb ft
55 lb ft
75 lb ft
90 lb ft
135 lb ft
150 lb ft