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4.Common service tasks
Common service tasks
Handling with hoist
Many service tasks are facilitated by means
of a hoist pulley device (see chapter Tools).
1. Secure the shearer unit to hoist by
means of a sling:
• attach with two shackles to frame of
adaptor plate
• hoist to vertical position:
– stabilise unit by slightly resting
jaw(s) on e.g. a wooden piece
• a vertical position facilitate good
reach from both sides:
– shafts of jaws and cylinders
– interior service
Hydraulic lines/couplings
Preparation
Make sure hydraulic coupling
areas are absolutely clean be-
fore opening!
• Take care of the spill; put a vessel or an
absorbent sheet under the coupling
THREADED COUPLINGS
2. Mark lines and hoses for your own ref-
erence and gently loosen the coupling.
Use two spanners not to twist hose.
Avoid hazardous spray! Use
eye-protection. Check that
hoses are pressure free.
3. Keep area clean and reduce spill
by plugging or covering all
openings*
:
)
(a) a tight fit plastic hat
(b) a nylon plug
Maintaining hydraulic operation
4. Use a metal PO-plug*
(c) when
)
maintaining operability of the
hydraulic system is desired.
Reassembling threaded couplings
5. Check that the O-ring is positioned
correctly in its slot.
– replace O-rings*
)
with cracks or signs of
wear
Reverse the steps as in 1—2 above.
HOSES
Before removal: mark or document how
hose is lead to ensure proper remounting.
6. Check that hoses are in good condition
– replace worn or damaged hoses
– check that hoses run smoothly
without kinks, twists or contact
to sharp edges
*
See Tools section of Workshop Manual
)
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Table of Contents
Troubleshooting
