Sir, i have ex330lc Hitachi 4 in number and they all have a similar problem that boom,swing ,stick and one truck moves faster but the truck and bucket is too slow, pumps flow/pressure was good but i don't know where the problem could be i need your support.
How many hours on each machine ?
Is the left track the slower one?
Oh Hitachi The older one is 5000 hours. Yes is the left truck. Thanks
Sounds like you need to check the pump that controls the left motor, it should be the one on the left if you are looking at it. It controls all of your slow functions. The boom uses combined pump flow and all others use the same pump. You say its fine and I don't agree. Has someone done any adjustments recently to the pumps shortly before your symptoms showed up?