dll6
Aluminum
- Joined
- Apr 23, 2005
- Location
- Washington
Mori MV35/40 Daikin pump noise & Taiyo hydraulic spindle counter balance seal blowout
It all began when my hydraulic pump started making noise after letting the machine sit to long.
Often when using the machine regularly, the hydraulic pump would make some noise at startup then quickly go away, this time it wasn't going away.
I pulled the hydraulic unit from the machine and disassembled the pump, looked it over for contamination and damage, individually purchased new seals and bearings, then reassembled.
-Does anyone know a domestic supplier to get a new axial cylinder and piston assembly for a Daikin V15 axial piston pump?
and/or
-Has anyone retrofitted a comparable open circuit pump (Parker, Rexroth, etc.) with approximately 15cm3/rev (0.90 in3/rev) output
that is pressure and flow adjustable, from 8-70kgf/cm2 and up to 27 lpm @ 1800 rpm (114-996 psi and up to 7 gpm ) and CW
rotation, to replace the Daikin unit?
At that point, being overly anxious to see if the noise was gone, I neglected to lower the operating pressure and/or flow of the pump when restarting the machine, for now there was air in the system, and proceeded to blow out the rod and wiper seals on the spindles hydraulic counter balance cylinder. Causing hydraulic fluid to pour from the spindle covers, once the spindles internal voids, having been well sealed by decades of chips, coolant and oil, finally over flowed.
Seems its now time for the coolant system, tramp oil removal project I've been putting off.
Upon disassembly of the counter balance cylinder I noticed the cylinder had been operating with some degree of side loading and had worn the brass/bronze cylinder end cap insert, that houses the rod and wiper seals, and to a lesser extent scuffed the cylinder rod as well. Probably leading to the hydraulic seals blowing out due to the air compressing in the cylinder from hydraulic oil entering at high pressure and flow.
At that time I also noticed the piston that drives the cylinder rod had what appeared to be (2) ring lands, with a "V" shaped profile that I would have thought would have seals in them, for sealing the piston to the cylinder bore, but there was nothing in them. The lands are approximately .080 inch wide and 0.60 inch deep to the bottom of the "V" groove. I'll disassemble the rest of the cylinder checking the piston-to-bore clearance as well as check the vented end for lost seal remnants.
-Is it possible the piston works without seals in the "V" grooves and not leak out the filter vented end of the cylinder?
I've been unable to locate a parts breakdown of the counter balance cylinder.
As a note the counter balance cylinder has only (1) hydraulic line on it so it is a single acting cylinder with a filtered vent, opposite the end with the hydraulic line. With no evidence of hydraulic fluid escaping the vent or of the vent being plugged up. I also witnessed hydraulic fluid spraying from the seal end of the cylinder when the pump was running noisily. Could be the large leak from the cylinder seals was causing my pump to cavitate noisily from an inability to keep up the flow demand.
-Has anyone had luck finding parts for the Taiyo 70H-6, type 1TC40C70N550-B0 counter balance cylinder? Specifically the
brass/bronze insert that houses the seals. I think the cylinder rod will polish up ok in the lathe with some 1000 wet/dry.
Upon cleaning parts I found no large debris in or stuck to the large magnet mounted in the bottom of the hydraulic tank, just a fine sedimentary layer across the bottom. At some point in the last 40 years I believe the Daikin pump had been replaced because it did not have the same color or durable Mori green paint on it.
My conclusion on the pump noise is either the counter balance cylinder began leaking, to a lesser degree than when starting the machine after sitting for a couple months, or there is a relief valve/control solenoid leaking/stuck for the counter balance cylinder.
I've come to that conclusion because after the seals blew out on the counter balance cylinder, I removed the hydraulic line to it and capped it, before positioning the spindle to remove the hardware affixing the sheet metal spindle covers and counter balance cylinder.
With the machine running the hydraulic pump noise was gone.
In a couple days I have replacement seals arriving for the counter balance cylinder and I am hoping with new seals, the worn cylinder seal insert assembly and rod will hold, after some rod cleanup and realignment.
Does anyone know of a Daikin parts supplier in the states?
and/or a comparable replacement pump?
Could the counter balance cylinder really run without piston seals ... Has anyone seen hydraulic piston seals that fit a "V"
profile?
I don't suppose anyone has a parts breakdown for the Taiyo counter balance cylinder?
Or has run into an alignment problem with it.
I will return with more details upon further disassembly.
Vancbiker ... SeeFair ?
It all began when my hydraulic pump started making noise after letting the machine sit to long.
Often when using the machine regularly, the hydraulic pump would make some noise at startup then quickly go away, this time it wasn't going away.
I pulled the hydraulic unit from the machine and disassembled the pump, looked it over for contamination and damage, individually purchased new seals and bearings, then reassembled.
-Does anyone know a domestic supplier to get a new axial cylinder and piston assembly for a Daikin V15 axial piston pump?
and/or
-Has anyone retrofitted a comparable open circuit pump (Parker, Rexroth, etc.) with approximately 15cm3/rev (0.90 in3/rev) output
that is pressure and flow adjustable, from 8-70kgf/cm2 and up to 27 lpm @ 1800 rpm (114-996 psi and up to 7 gpm ) and CW
rotation, to replace the Daikin unit?
At that point, being overly anxious to see if the noise was gone, I neglected to lower the operating pressure and/or flow of the pump when restarting the machine, for now there was air in the system, and proceeded to blow out the rod and wiper seals on the spindles hydraulic counter balance cylinder. Causing hydraulic fluid to pour from the spindle covers, once the spindles internal voids, having been well sealed by decades of chips, coolant and oil, finally over flowed.
Seems its now time for the coolant system, tramp oil removal project I've been putting off.
Upon disassembly of the counter balance cylinder I noticed the cylinder had been operating with some degree of side loading and had worn the brass/bronze cylinder end cap insert, that houses the rod and wiper seals, and to a lesser extent scuffed the cylinder rod as well. Probably leading to the hydraulic seals blowing out due to the air compressing in the cylinder from hydraulic oil entering at high pressure and flow.
At that time I also noticed the piston that drives the cylinder rod had what appeared to be (2) ring lands, with a "V" shaped profile that I would have thought would have seals in them, for sealing the piston to the cylinder bore, but there was nothing in them. The lands are approximately .080 inch wide and 0.60 inch deep to the bottom of the "V" groove. I'll disassemble the rest of the cylinder checking the piston-to-bore clearance as well as check the vented end for lost seal remnants.
-Is it possible the piston works without seals in the "V" grooves and not leak out the filter vented end of the cylinder?
I've been unable to locate a parts breakdown of the counter balance cylinder.
As a note the counter balance cylinder has only (1) hydraulic line on it so it is a single acting cylinder with a filtered vent, opposite the end with the hydraulic line. With no evidence of hydraulic fluid escaping the vent or of the vent being plugged up. I also witnessed hydraulic fluid spraying from the seal end of the cylinder when the pump was running noisily. Could be the large leak from the cylinder seals was causing my pump to cavitate noisily from an inability to keep up the flow demand.
-Has anyone had luck finding parts for the Taiyo 70H-6, type 1TC40C70N550-B0 counter balance cylinder? Specifically the
brass/bronze insert that houses the seals. I think the cylinder rod will polish up ok in the lathe with some 1000 wet/dry.
Upon cleaning parts I found no large debris in or stuck to the large magnet mounted in the bottom of the hydraulic tank, just a fine sedimentary layer across the bottom. At some point in the last 40 years I believe the Daikin pump had been replaced because it did not have the same color or durable Mori green paint on it.
My conclusion on the pump noise is either the counter balance cylinder began leaking, to a lesser degree than when starting the machine after sitting for a couple months, or there is a relief valve/control solenoid leaking/stuck for the counter balance cylinder.
I've come to that conclusion because after the seals blew out on the counter balance cylinder, I removed the hydraulic line to it and capped it, before positioning the spindle to remove the hardware affixing the sheet metal spindle covers and counter balance cylinder.
With the machine running the hydraulic pump noise was gone.
In a couple days I have replacement seals arriving for the counter balance cylinder and I am hoping with new seals, the worn cylinder seal insert assembly and rod will hold, after some rod cleanup and realignment.
Does anyone know of a Daikin parts supplier in the states?
and/or a comparable replacement pump?
Could the counter balance cylinder really run without piston seals ... Has anyone seen hydraulic piston seals that fit a "V"
profile?
I don't suppose anyone has a parts breakdown for the Taiyo counter balance cylinder?
Or has run into an alignment problem with it.
I will return with more details upon further disassembly.
Vancbiker ... SeeFair ?