In Reply to: Re: The Hydraulic Oil Story posted by TheOldHokie on December 30, 2013 at 11:29:46:
Agree
FO-4 states on page 12 that either M2C 134-D or SAE 90 EP gear oil is acceptable
SAE 80 EP gear oil is also acceptable, but this oil is longer available.
Page 96 states the minimum pressure at the test port should be 1500 psi.
Is the test port pressure based on UTF or SAE 90?
The hydraulic pump volumeric efficiency increases with increase in viscosity and mechanical efficieny decreases with increase in viscosity.
Looking at the Surplu center 2013 catalog the gear type hydraulics pumps range from 2300 to 3200 psi rated output pressure. The smaller the pump the greater the output pressure.
The Vickers vane type pump is rated between 2200 to 2500 psi
The Reliance radial piston pump is rated at 2350 psi
Also noticed the TSC/traveller brand ISO 46 hydraulic oil has a viscosity = 46 cSt at 40C(104F). TSC site lists the ISO 46 hydraulic oil having viscosity = 220 SUS at 100F = 47.5 cSt @ 100F
Would conclude from this exercise that ISO 68 has a viscosity = 68 cSt @ 40C
The data from Warren distributing the blender of TSC/traveler label UTF shows
premium UTF viscosity = 57.0 cSt @ 40C & renew UTF viscosity = 59.8 cSt @ 40C
Based on this comparison the TSC/traveller premium UFT is exactally half way between ISO 46 & ISO 68 hydraulic oil ...(46+68)/2 = 57
Using 1500 psi minimum pressure and 2.5" dia N hydraulic ram, estimate the lifting capacity ~ 1500# at the lower link end hole, combined.
Qustion is: what is the test port pressure using UTF vs SAE 90 with a rebuilt Ferguson hydraulic piston pump?
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