Dismantling and Assembly:
- Dipper Ram
Assembly (continued)
a
Use a drill the same diameter as the pre-drilled hole
in the piston head to make a 'centre mark' in the
piston rod. DO NOT drill the piston rod at this
stage.
b
Use an undersized diameter drill as a guide and drill
into the piston rod to the required depth (see table),
make sure the drill has centred correctly on the
'centre mark' made at step 5a.
c
Use the correct size diameter drill to suit the dowel
and drill to the required depth (see table).
d
Remove all swarf and contamination, insert the
dowel.
Position cylinder on bench and install rod assembly into
cylinder.
Apply JCB Threadlocker and Sealer (High Strength) to first
three threads of cylinder, torque tighten the end cap to 678
Nm (500 lbf ft).
Note:
If hydraulic oil contacts the uncured JCB Threadlocker
and Sealer (High Strength) a weakening of the bond will
result . Cure t im es vary ac c o rd ing t o t he am b ient
temperature. Allow a minimum of 2 hours between assembly
and filling the ram with oil.
Note:
Cold weather operation. When operating in conditions
which are consistently below freezing, it is recommended
that the rams are operated slowly to their full extent before
commencing normal working.
Torque Settings
Item
Nm
kgf m
lbf ft
7
405
41.3
300
1
678
69.2
500
DRILLING DETAILS FOR PISTON HEAD RETENTION
(all dimensions in mm)
Ram Dowel
Guide
Guide
Dowel
Dowel
Size
Size
Drill Ø
Drill
Drill Ø X
Drill
Depth
Depth Y
80 x 50
6Ø x 20
4
21
6.02/6.10
22/23
70 x 40
90 x 50
8Ø x 25
5
24
8.02/8.10
27/28
100 x 60
110 x 60 12Ø x 30
8
28
12.02/12.10 32/33
110 x 65
120 x 65 12Ø x 35
8
33
12.02/12.10 37/38
130 x 75
86 - 3
Section E
9803/3280
Section E
86 - 3
Issue 1
Hydraulic Rams
Y
X
A263750
