Simpro DUMPMASTER DM0700, Руководство пользователя

Страница: 22 / 60

3.3.2 Cradle jams while lowering
There are three types of problem which can prevent the cradle from lowering when the
LOWER button is pressed:
hydraulic, electrical, and mechanical faults.
The cradle is not powered down – it is lowered by gravity alone.
See §3.7.6 for a schematic diagram of the hydraulic system.
3.3.2.1 Hydraulic or electrical fault
When the LOWER button is pressed, the lowering valve should emit a ‘click’ sound as it
opens. If it does not, the problem may be either a hydraulic or electrical fault.
1. Manually disable the safety door interlock as per §3.8.3.1 , and open the door.
2. Attach lifting slings to a forklift or hoist, and carefully take the weight of the cradle.
Never place any part of your body underneath the cradle unless it is securely supported.
3. Remove the powerpack cover.
4. Unscrew the fitting attaching the steel hydraulic pipe to the powerpack, and hold the
end of the pipe over a container with a capacity of at least 2 litres.
5. Lower the cradle slowly with the forklift, collecting the oil in the container.
6. Once the cradle is fully lowered, remove the bin.
7. Reconnect the hydraulic pipe and fitting, and refill the oil tank.
8. Check that the lowering valve coil is receiving an electrical signal. An LED
lamp should glow on the coil plug when the LOWER button is pressed. If it does not,
check the up/down switch and wiring.
9. If the coil is receiving an electrical signal but not opening, it may need to be cleaned:
a. Remove the coil from the valve stem.
b. Unscrew the lowering valve cartridge.
c. Clean the cartridge with compressed air.
d. Replace the lowering valve components by reversing this procedure.
10. Replace the lowering valve, and test to see if the cradle lowers correctly. If the
problem persists, the lowering valve coil or cartridge may need to be replaced
–
contact your agent for support.
11. Re-enable the interlock as per §3.8.3.1 , and run the machine through several
complete tipping cycles with no bin in the cradle, to ensure the problem has been
properly resolved.
3.3.2.2 Mechanical fault
If the lowering valve is operating correctly (emi ts a ‘click’ sound when the LOWER button is
pressed), the problem may be a mechanical fault.
1. Manually release the safety door interlock as per §3.8.3.1 , and open the door.
2. Provide support for the cradle, either with a structure underneath or with a sling
holding it to the top of the main frame. Allow for it to fall no more than 50mm.
Never place any part of your body underneath the cradle unless it is securely supported.
3. Attempt to visually identify the cause of the jamming. The most likely faults are:
0250090067
0250090055