Farmi Forest FT9, Operation, Maintenance And Spare Parts Manual

Page: 24 / 68

FT9 24
MAINTENANCE
• Maintenance work must be carried out regularly to
ensure safe and trouble-free operation.
• Always use the appropriate tools.
• Determine the location of the defect.
• Keep the disassembled sections, removed parts, and
the repair area protected from dirt.
• Clean the parts using kerosene, never fuel oil.
LUBRICATION
Refill fresh grease until some old grease escapes. Wipe
off excess grease.
CHECK AND LUBRICATE HUBS
Remove the hub cap. Check the bearing case for ingress
of water. If there are signs of water, rust or dirt, disas-
semble and carefully clean the hub. Replace bearings
and seals if necessary.
When assembling the hub, apply grease to the sliding
surfaces of the bearings. Then lubricate and relubricate
as follows:
1. Open the bleed screw.
2. Grease the bearings through the nipples until some
of the existing grease escapes through the bearings.
3. Do not use too much grease; otherwise, the hub
can overheat during travel.
4. Afterwards, close the bleed screw and remount the
hub cap.
On a hub equipped with a brake check the conditi-
on of the brake shoes. If the friction surface has worn
down to less than 2 mm, replace the brake shoes. Clean
the brake parts and the brake drum before assembly.
Slightly lubricate the articulated joints.
REPLACING BEARINGS
• When installing bearing sleeves, use an appropriate
drift.
• Make sure that the new bearing’s grease hole meets
the nipple.
• If the bearings have grease pockets, fill these with
Vaseline.
PRESSURE MEASUREMENT
Always make the adjustments with the manometer in
place.
• The main pressure is measured from the measu-
ring point in the control valve’s inlet section.
• Adjustments and inspections for each movement:
• Set the main pressure relief valve to 5 bar
above the value set for the protective valve.
• Performthemovement, and check and adjust
the pressure if necessary.
• Finish by adjusting the main pressure to the
set value.
• Pressure measurements are to be performed at the
normal operating temperature and at the normal
flow rate.
• The free flow pressure can be read from the ma -
nometer when the flow of oil is directed through
the valve.
REPAIR WELDING
If welding is required for modifying or repairing the
crane, note the following:
• The welder must be qualified: welding grade 3.
There must be no root defects.
• Remove paint and any oil from the location to be
welded.
• Connect the ground terminal directly to the piece
to be welded – there must be no joints in between.
• Use OK 48.00 or equivalent electrodes. The
electrodes must be dry.
• Improperly welded structures can get fractured.