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Operating -
Hydraulics / Air conditioning Setting PTO speed The hydraulic pump is geared so that 540 r.p.m. on the PTO is reached at a minimum engine speed of 2000 rpm (2,400rpm for four wheel steer machines). To set the PTO for 540, or indeed any other required speed, increase the engine speed to approx. 2800 rpm and adjust the speed with the knob adjacent to PTO control lever. The actual PTO speed can be read off the LH display of the ICM (see previous pages). Turning the knob anti-clockwise will increase the speed and clockwise will decrease the speed. Once the speed is set, if the engine rpm is increased there will not be a significant increase in PTO speed. The PTO speed should never exceed 600 rpm For most spraying operations you will find it is not necessary to always run the PTO at 540 rpm. Lower PTO speeds result in reduced wear and tear in the spray pump and hydraulic system, a lower engine power requirement and can help to prevent foaming in the spray tank. If the sprayer is fitted with a high capacity spray pump e.g. 4, 5 or 6 cyl. the PTO speed should be set as low as possible whilst spraying. Speeds in the order of 350 rpm for a 6 cyl. pump and 450 rpm for a 4 cyl. pump are normally more than adequate to achieve working pressure with excess flow left for agitation. Higher speeds may result in overheating of the hydraulic system. The PTO speed can then be increased to 540 after each load for quick-filling if required. It is important to ensure that sprayer filters are kept clean and that self-cleaning filters are working correctly at all times. Failure to do so will result in loss of PTO speed and overheating of the hydraulic system. Spool valves The Hydraulic spool valves are operated by the levers to the left of the seat. The decal infront of the levers indicates the normal control functions for spray boom folding. There may be up to 6 valves fitted (4 normally fitted as standard) which can be any combination of single and double acting spools. A double acting spool can be safely used to operate a single acting service if required. The hydraulic system/spool valve(s) fitted are only designed for intermittent operation of hydraulic cylinders and should not be used to power motors or other hydraulic circuits. Maximum pressure at the spools is approx. 1800 psi (124bar) Please consult the manufacturer if you require higher pressures or if wish to use them for any other purpose. Please ensure that all couplings are clean before connecting hoses and that any couplings that are not in use are protected with plugs / caps. Ingress of dirt into the hydraulic system can lead to premature wear and possible failure of major components.
The air conditioning unit is integrated into the ventilation system within the cab roof. The unit will cool or heat the air which is partly drawn in to the cab through a carbon filter and partly re-circulated. This ensures the cab is kept positively pressurised to keep dust and vapours out of the cab.
Operation
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