Nilfisk-Advance 107146895, Руководство по обслуживанию, Страница: 51 / 101

51
SM_MH 3M_4M Ver.1.2_May 2016
Function
D
MH 4M PA model, Function Unloader system
1. Motor/pump Unit.
2. Micro switch.
3. Activation arm.
4. Unloader spring.
5. Unloader piston.
6. Ball for by-pass.
7. Non return valve.
8. Ergo spray handle.
Unloader—Open spray handle.
Machine in stand-by with stand-by pressure.
Mounted with a lance and high pressure nozzle
the spray handle (8) is now activated.
The non return valve (7) opens, the pressure in
the hose drops and release the pressure on the
backside of the unloader piston (5). The unloa-
der spring (4) presses the unloader piston (5)
backwards and drags the activation arm (3)
away from the micro switch (2) and the motor/
pump (1) starts.
The pressure rises to working pressure and
remains constant during operation.
1
2
3
6
4
5
7
8
Motor/pump
Pressure Activated Unloader— working pressure (open spray handle