I was using the 600A yesterday. Drove it to the worksite about 1/2 mile. Then, I rose the main boom, and telescoped the fly boom almost to full extension.
The lowest tower main Boom Assembly then rocked forward causing the whole upper section to drop suddenly.
Thankfully I was secured in the basket and had a hand on the cage.
I then retracted the fly boom, which caused the balance to change and the Boom Assy then rocked back to lowered position which was another catapult ride in the basket.
Got the basket down, checked the hydraulic fluid. I then moved the tower telescoped cylinder up / down which seemed to work normally.
The sensation was like there was no hydraulic fluid in the tower telescope cylinder so when the upper section reached it's tip point, there was no fluid to control the tower cylinder. Once the fluid compressed, the upper section stopped it's fall. It was slightly dampened stop. ie: not metal on metal like the cylinder topping out or in.
Any ideas? Could the fluid have left the cylinder during storage? Is it good practice to cycle all cylinders before raising? It had been a couple of months sitting before being used yesterday.
The lowest tower main Boom Assembly then rocked forward causing the whole upper section to drop suddenly.
Thankfully I was secured in the basket and had a hand on the cage.
I then retracted the fly boom, which caused the balance to change and the Boom Assy then rocked back to lowered position which was another catapult ride in the basket.
Got the basket down, checked the hydraulic fluid. I then moved the tower telescoped cylinder up / down which seemed to work normally.
The sensation was like there was no hydraulic fluid in the tower telescope cylinder so when the upper section reached it's tip point, there was no fluid to control the tower cylinder. Once the fluid compressed, the upper section stopped it's fall. It was slightly dampened stop. ie: not metal on metal like the cylinder topping out or in.
Any ideas? Could the fluid have left the cylinder during storage? Is it good practice to cycle all cylinders before raising? It had been a couple of months sitting before being used yesterday.