Hi Michael,
You have got excellent direction from all on this forum, which is aligned with the operator manual.
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Thank you for your replies,

I expected this to be the case as I did do tests with handbrake on incline and inching valve adjustment, however I was under the impression that with full travel of the inching valve, before contacting the park brake switch, would, release enough brake feed pressure that the brake units would completely stop the machine.

Thanks you both for clarifying.

Regards
Michael

the reply from bley is correct the unit will not stop as a conventional forklift the park brake is either applied from the the dashboardor the inching pedal when fully depressed after two seconds the park brake will engage as he pointed out the test to do on the inching pedal disconnect switch under inching pedal fully depress it and put unit in drive full revs if unit moves adjust the inching valve at the lever so unlock the lever the shaft has a screwdriver slot turn shaft anticlockwise to shut of drive when pedal is fully depressed one other test that you should do is pick up heavy load place unit on an incline and engage park brake the unit should hold no movement if truck moves you need to investigate brake valve which is at the front of unit on its own just above the 6 port valve if valve appears ok you could have front wheel motors leaking internally which is usually diagnosed when removing outer plate of wheel motor if oil is present motor has to be changed but if all units are the same i would also say the operator does not understand the units operation

This is might just be normal operation if all units react the same.

These units do not have a conventional mechanical service brake system.

I usually get this call when a new operator that has never driven a combilift before doesnt understand how the truck operates and assumes its like a normal counterbalance truck with a mechanical service brake.

The inching pedal dumps the drive pumps pilot pressure for the swash plate to tank returning the swash plate to its neutral position.

The truck slows down due to the 3 hydraulic drive unit wheel motors natural resistance.

The inching pedal also has a brake switch located beneath it. The operation of the switch is to apply the parking brake after a time delay which is usually set around 2 seconds.

The unit will have an increased stopping distance depending on the weight of the load its carrying, the speed of the unit before the inching pedal is depressed as well as the grade at which it is trying to stop on.

I highly suggest that the operator reads all operating guidlines in the operators manual.

Only thing that may cause an issue is if the inching pedal is out of adjustment and is not dumping full pilot pressure to tank in the fully applied/down position.

Easiest way to tell would be to unplug the switch beneath the pedal. Start the truck. Fully apply the inching pedal. Place the unit in drive and rev up the engine. If the unit starts to drive on flat ground, the inching pedal will need to be adjusted.