Claas ROLLANT 250, Repair Manual

Page: 16 / 31

1.3.2
RHB ROLLANT 250 / 250 RC - 298 332.0
General repair information
Before applying the liquid locking compound, the metal
surfaces where Aktivator has been applied must have
dried. Especially in blind holes, no Aktivator (cleaning
agent) residues are allowed.
When installing bolts, apply the liquid locking
compound only to the internal thread (nut) if possible in
small quantities (drops). In blind holes only wet
approx. 1d (d = nominal diameter of bolt) at the thread
bottom. The same applies to any extra-long female
threads. When applying the liquid locking compound to
the bolt or at the top end of a female thread, the liquid
locking compound will spread over the entire thread
length when screwing the bolt in. As a result, too much
break-away torque is required to remove the bolt –
Danger of breaking!
Threaded assemblies secured with liquid locking
compound can be easily unscrewed by heating them
up to approx. 200 °C.
Correct installation of lock collar bearings
Lock collar bearings are tightened on the shaft by
rotating the eccentric ring over the inside bearing ring.
Prior to installation, apply semi-fluid lubricant of NLGI
class 00 (e.g. Shell Retinax G or similar brands) to the
inside ring and the shaft to make bearing removal
easier during future repairs.
Always fasten the eccentric ring moderately in the
direction of rotation of the shaft and lock by means of a
set screw. To remove the bearing, loosen the eccentric
ring in opposite direction of rotation of the shaft.
Correct installation of adapter sleeve bearings
Adapter sleeve bearings do not require a specially
machined bearing seat. They may be mounted on any
drawn or scalped shaft. This is an advantage because
it allows the shaft to be axially moved as required to
obtain correct alignment.
Always install adapter sleeve bearings according to
the conical inside ring. Clean the taper lock adapter
sleeve and the shaft and check that the sleeve nut
runs easily so the taper lock adapter sleeve will not
turn on the shaft when tightening.
Tightening the bearing:
First tighten the sleeve nut to the point where the taper
lock adapter sleeve has no more play and is under
slight preload. Now tighten the nut by approx. 90° and
continue turning until the next nearest slot fits the tab.
Secure sleeve nut with the tab.
Loosening the bearing:
Bend up the tab which secures the sleeve nut and first
back off the nut a few turns only (the thread must still
fully grip). Loosen the taper lock adapter sleeve with a
sharp blow, using a block-ended tube.
Ferrule fittings on hydraulic lines
When pre-assembling the unit and for pre-assembled
factory-delivered ferrule fittings, the following applies:
installation is in the associated, well-oiled threaded
joint with half a turn of the union nut beyond the point
where resistance is felt.
Pre-assembly:
1. Cut off the tube at right angles. Do not use a pipe
cutter because this will slant the tube wall, causing
heavy inside and outside burrs. Slightly deburr the
tube end on the inside and outside (do not
chamfer!) and clean it. In case of tube bends, the
straight tube end up to where the bending radius
starts must be at least twice the height of the
union nut.
2. Push the union nut and the ferrule on the tube.
3. Push the tube against the stop in the union and
tighten union nut until the ferrule grips the tube
(the tube must not rotate with the nut). This point
can be felt because increase power is needed
from here.
4. Tighten the union nut half a turn beyond the point
where resistance is felt.
5. Check the cut made by the ferrule edge: A visible
shoulder must fill the space before the ferrule front
end. The ferrule may rotate, but axial dis-
placement must not be possible.
Installation:
Insert the pre-assembled tube into the well-oiled
threaded joint, tighten the union nut up to the point
where resistance is felt and then half a turn beyond
this point.