Zac93
Member
Hey guys any thoughts on the following issue. Working on a 330D L Japan Market machine RDA, the equivelant SN is NBD
The fault started with the boom lifting on its on at all times while the engine was running, the operator was able to still lower the boom using the controls. This happened in the morning during operation and then when the machine was shut off for lunch it would not start. It cranks slowly, doesnt start(about 60rpm is to slow to fire i beleive) and as it cranks the boom lifts.
As it cranks the drive pump is reading pretty much zero pressure at the test port. it is loading up the idler pump, generating at least 1000psi, as the pressure increases the engine slows further until it stops due to load exceeding the batterys ability to supply power.
Checked the spools, found them to not be stuck and found the springs not broken etc. Removing the spool caps and then cranking the machine shows no movement in the spools. This tells me the oil is not getting to the boom through the normal passage. But I could be wrong.
We also disconnected the pilot pump to isolate any pilot cross feed with no change to the issue.
Has anyone had any issues similar to this or has heard of anything? We would like to pinpoint the issue before pulling the valvebank etc
The fault started with the boom lifting on its on at all times while the engine was running, the operator was able to still lower the boom using the controls. This happened in the morning during operation and then when the machine was shut off for lunch it would not start. It cranks slowly, doesnt start(about 60rpm is to slow to fire i beleive) and as it cranks the boom lifts.
As it cranks the drive pump is reading pretty much zero pressure at the test port. it is loading up the idler pump, generating at least 1000psi, as the pressure increases the engine slows further until it stops due to load exceeding the batterys ability to supply power.
Checked the spools, found them to not be stuck and found the springs not broken etc. Removing the spool caps and then cranking the machine shows no movement in the spools. This tells me the oil is not getting to the boom through the normal passage. But I could be wrong.
We also disconnected the pilot pump to isolate any pilot cross feed with no change to the issue.
Has anyone had any issues similar to this or has heard of anything? We would like to pinpoint the issue before pulling the valvebank etc
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