ATLET A-Ergo, Service Manual

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SERVICE MANUAL A-ERGO SERVICE MANUAL A-ERGO
H Hyd ydrra au ulliic s c sys ystte em / m / D De esi sig gn a n an nd f d fu un c n cttiio on / n / H Hy yd drra au ulliic d c diia ag grra am m 8 8..3 3
Lifting function Lifting function
The pump supplies pressure to the The pump supplies pressure to the control valve, which in turn control valve, which in turn closes the pressure closes the pressure
chamber completely. This pressure also opens the non-return valve and then continues chamber completely. This pressure also opens the non-return valve and then continues
through the open proportional valve to the lift
through the open proportional valve to the lift cylinders If the lift cylinders If the lift cylinders are obstructed, cylinders are obstructed,
have an excessive load, or if there is a have an excessive load, or if there is a fault on the proportional valve so that it does not fault on the proportional valve so that it does not
open, the oil will return to open, the oil will return to the tank through the pressure limiting valve. the tank through the pressure limiting valve.
Lowering function Lowering function
The control valve opens to release the oil from the lift The control valve opens to release the oil from the lift cylinders. Since the non-return cylinders. Since the non-return
valve is closed, the valve is closed, the only way out for only way out for the oil is the oil is through the pressure chamber. The flow through the pressure chamber. The flow
through the pressure chamber is in turn through the pressure chamber is in turn controlled by the pressure difference over the feed controlled by the pressure difference over the feed
restriction in the proportional valve, restriction in the proportional valve, since the control valve does since the control valve does not receive pressure not receive pressure
from the pump. from the pump.
Lowering brake function Lowering brake function
The pressure chamber is the heart of the electrical control valve. The pressure chamber is the heart of the electrical control valve.
Important! Important!
It is set at the It is set at the factory and should NEVER be altered. factory and should NEVER be altered.
The feed restriction in the proportional valve has a stroke length limit, which can be The feed restriction in the proportional valve has a stroke length limit, which can be set set
from outside. The stroke from outside. The stroke length limit governs the maximum lowering length limit governs the maximum lowering speed. speed.
The pressure chamber maintains a constant pressure drop over the feed restriction The pressure chamber maintains a constant pressure drop over the feed restriction in the in the
proportional valve during lowering. This enables the lowering proportional valve during lowering. This enables the lowering speed to remain constant speed to remain constant
regardless of the load, and regardless of the load, and therefore no external lowering brake valves are therefore no external lowering brake valves are required. required.
Hydraulic diagram Hydraulic diagram
Table 8.1 Table 8.1 List of hydraulic diagrams for A-Ergo List of hydraulic diagrams for A-Ergo
D Deessccrriip pttiio on n P Pa ag gee
H Hy yd drraau ulliic c d diiaag grraam m, , M Maan nu uaal l v vaallv ve e 1 10 04 40 01 14 4 ((– –2 20 00 08 8w w4 45 5)) 8 8..4 4
H Hy yd drraau ulliic c d diiaag grraam m, , M Maan nu uaal l v vaallv ve e 1 10 04 40 01 14 4 ((2 20 00 08 8w w4 46 6– –)) 8 8..6 6
H Hy yd drraau ulliic d c diiaag grraam m, , P Prro op po orrttiio on naal v l vaallv ve 1 e 10 04 40 00 05 ( 5 (– –2 20 00 08 8w w4 45 5)) 8 8..8 8
H Hy yd drraau ulliic c d diiaag grraam m, , P Prro op po orrttiio on naal l v vaallv ve e 1 10 04 40 00 05 5 ((2 20 00 08 8w w4 46 6– –)) 8 8..1 10 0
H Hy yd drraau ulliic c d diiaag grraam m, , A AL LL L 1 10 04 49 91 13 3 8 8..1 12 2
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