wdchyd
Elite Member
X2..........yep, time for a flow test
Hydraulic power fading with normal use.
- Thread starter nox273
- Start date
- Views: 12634
X2..........yep, time for a flow test
IceStationZebra
Gold Member
I couldn't find any specific data from Keiki so I looked at general recommendations. You want to look at two things - viscosity and oxidation.
Viscosity: generic optimum range is 10-50 cst. For the common viscosities we get:
VG68 - 45-92c (113-198f)
VG46 - 38-84c (100-183f)
VG32 - 30-75c (86-167f)
Oxidation: higher temps oxidize the oil faster, in fact every 10c (18f) doubles the rate. For nonsynthetic oil the tempuratures are generally recognized as:
recommended: 49-60c (120-140f)
max: 82c (180f) [~2500hr life]
do not exceed: 93c (200f)
So your normal temps of 50-60c are a little on the cool side of the range but certainly acceptable. Most mobile equipment pushes the high side because it minimizes cooler size, a little lower pressure drops, etc.
I stand corrected, ISZ.
I thank everyone for their time and comments.
Today I received my pressure test gauge (don't have the money for a flow test gauge). I connected it too my auxiliary port and ran the motor from cold. pressure was 2050psi with the motor at maximum revs (3500 rpm).
I then ran the digger for a good half an hour with a good combination of using all controls and making the digger labour with many heavy loads until I noticed the power dropping off.
I then stopped the motor re-connected the pressure gauge and took the reading again. It quickly jumped to 1500psi and slowly crept to 1600 psi over a few seconds and would not go any further.
I then backed out the pressure relief valve which is mounted right next to the motor until I had a reading of 1000psi. Then I screwed the relief valve in half a turn at a time and checking the gauge. It slowly went higher as I screwed it in until it hit the 1600psi mark and the pressure would go no further no matter how far I adjusted the RV in. It even bottomed out at one point but the reading was still 1600psi.
The next test I would like to do is adjust the RV when it is cold to see If I can get any more than 2000psi. Not sure if it will as the motor starts to bog down quite considerably at 2050psi when cold.
Is it starting to look like the pump, seems to be heading that way.
Today I received my pressure test gauge (don't have the money for a flow test gauge). I connected it too my auxiliary port and ran the motor from cold. pressure was 2050psi with the motor at maximum revs (3500 rpm).
I then ran the digger for a good half an hour with a good combination of using all controls and making the digger labour with many heavy loads until I noticed the power dropping off.
I then stopped the motor re-connected the pressure gauge and took the reading again. It quickly jumped to 1500psi and slowly crept to 1600 psi over a few seconds and would not go any further.
I then backed out the pressure relief valve which is mounted right next to the motor until I had a reading of 1000psi. Then I screwed the relief valve in half a turn at a time and checking the gauge. It slowly went higher as I screwed it in until it hit the 1600psi mark and the pressure would go no further no matter how far I adjusted the RV in. It even bottomed out at one point but the reading was still 1600psi.
The next test I would like to do is adjust the RV when it is cold to see If I can get any more than 2000psi. Not sure if it will as the motor starts to bog down quite considerably at 2050psi when cold.
Is it starting to look like the pump, seems to be heading that way.
jenkinsph
Super Star Member
Sounds like that new pump with low hours is not working out. Is it under any warranty?
