Hello All, We have a Liebherr L566 wheel loader. Problem with the machine is that it makes a roaring noise when slowing down. If brake are applied the roar is louder. Truck has a 3 speed gearbox with hydrostatic drive and when shifting gears it has difficulties and it looks like it switches them in delay. So that gears stay longer. No errors found, no warning signals, hydraulic oil is ok, hydraulic oil filters clean, transmission oil and transmission oil filter renewed. Gear pump that gives pressure to switch gears is ok. The wheel loader has a decrease in power. Can please anyone help in finding what is wrong with the truck ?? Best regards,
Did you open the filters up?
Yes, all clear. In hydraulic and transmission system.
Possibly its the travel pump starting to go. It makes a similar noise. As well Liebherr had axle problems on the machines. Do you add the lubricant to the gear oil? If you don't add enough lubricant, Limited Slip Differential Oil, then you could have the same problem as well. The rear ends oil has to be dropped/changed every 1,000 hours.
Do you have a hydraulic driven engine cooling fan that can change the direction of air flow through the radiator?