5-18 SHB 28Z3 EN – Edition 2.0 * 28z3s510.fm
Hydraulic system
5.3 Drive counterbalancing system
Without drive counterbalancing system
Actuating the boom as you drive causes the machine to leave its track!
(P1, P2 each supply a drive, and the boom function is also governed by P1 or P2)
With drive counterbalancing system
If the boom is actuated as you drive straight ahead, the machine stays in its track, but drive
speed does not remain constant.
The drive counterbalancing system is activated with the left-hand side drive and a boom
function (bucket, boom, stick or auxiliary hydraulics).
Function
☞ The drive counterbalancing system is enabled by means of an increased banking-up
pressure if both piston valves for driving and a boom function are activated.
➥ P3 takes over all boom functions
Pump assignment for drive counterbalancing
Hydraulic supply by pump 1
• Right-hand drive section
Hydraulic supply by pump 2
• Left-hand drive section
Hydraulic supply by pump 3
• Bucket section
• Boom section
• Stick section
• Auxiliary hydraulics section
• Auxiliary hydraulics flow rate adjustment segment
• 3rd control circuit section (option)
• Boom swivel
• Stabiliser blade section
• Swivel unit section
• Drive counterbalancing system section
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