Section E - Hydraulics
Rams
Typical Ram
E-148 E-148
9803-9340-8
2 Remove all swarf and contamination. Insert dowel 5
into the drilled hole, making sure that the tapped
extractor hole is to the outside.
New piston head fitted to a pre-drilled
piston rod
1 Redrill and dowel BOTH the piston head and piston
rod at 90° from the existing drilled dowel hole in the
piston rod. Follow the procedure K New rod and
piston head ( T E-147).
New piston rod fitted to a pre-drilled
piston head
Use the pre-drilled hole in the piston head. Care must be
taken not to elongate the existing hole in the piston head.
1 Use a drill of 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.
2 Use an undersized diameter drill as a guide and drill
into the piston rod to the required depth
K Table 1.
Drilling Details For Piston Head Retention (all
dimensions in mm) ( T E-148), making sure that the
drill has centred correctly on the 'centre mark' made
in step 1.
3 Use the correct size diameter drill to suit the dowel
and drill to the required depth
K Table 1. Drilling
Details For Piston Head Retention (all dimensions
in mm) ( T E-148).
4 Remove all swarf and contamination. Insert the dowel
5 into the drilled hole, making sure that the tapped
extractor hole is to the outside.
Table 1. Drilling Details For Piston Head Retention (all
dimensions in mm)
Taking care to retain the end cap 1 at the further end of the
piston rod from the cylinder, coat the thread of the cylinder
with JCB Activator. Next apply JCB Threadlocker to the
thread of the end cap. Wait 15 minutes before bringing the
two together and then torque-tighten the end cap into the
cylinder.
Note: If hydraulic oil contacts uncured Threadlocker, a
weakening of the bond will result. Cure times vary
according to the ambient temperature. Allow
approximately 1 hour at 20 °C between assembly and
filling the ram with oil.
Note: When fitting cylinder and piston eye bushes 12,
ensure that the split in the bush is set at 90° to the
longitudinal centreline of the cylinder.
Table 2. Torque Settings
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.
Ram
Size
Dowel
Size
Guide
Drill Ø
Guide
Drill
Depth
Dowel Drill
Ø X
Dowel
Drill
Depth Y
50 x 90 25 x 8Ø 4 19 8.1-8.02 27-28
60 x
110
30 x
12Ø
6 25 12.1-12.02 32-33
Item Nm kgf m lbf ft
Lift ram
1 678 69 500
6 405 41 300
Crowd ram
1 678 69 500
6 405 41 300
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