RA 90 221/05.93

1

General Notes

The fluid in a hydraulic circuit must be carefully selected as soonas possible in the design stage of the project in order to achievereliable and economic operation of the system.

All requirements cannot be met simultaneously—for example, ona price basis—and the user must therefore carefully weigh thevarious factors involved.

The viscosity and the viscosity/temperature coefficient are ofprimary importance, as are the density and the pour point.

For a short time at start-up, a viscosity of (below) is permissible.

νStart ≤ 4640 SUS (1000 mm2/s)

For some products viscosity limit up to 7425 SUS (1600 mm2/s) ispermissible. See product data sheet for details.

The operational limits of viscosity which must be guaranteed for fullfunctionality of the system at 100% duty are:

νOperating = 75…465 SUS (16...100 mm2/s)

For maximum efficiency and economy, the limits of viscosity are:

νopt

= 74…167 SUS (16...36 mm2/s)

Incomplete lubrication (and associated friction and wear) starts tooccur at:

νmin ≥ 45 SUS (10 mm2/s)

In order to match the viscosity to the various viscosity indices,fluids of different viscosities are available. These vary between102 and 316 SUS (22 and 68 mm2/s), taken at a temperature of104° F (40° C).

Normal HLP hydraulic oils have a viscosity index of approxi-mately 100 (see selection diagram).

HVLP hydraulic oils and multi-grade engine oils have a viscosityindex of more than >140 and are therefore suitable for greatertemperature range (mobile applications).

Environmentally acceptable hydraulic fluids known at the presenttime have viscosity indices greater than >130 and values up to220 may be achieved.

In order to determine the degree of wear protection provided by aparticular fluid and the permissible operating pressure range, the

FZG-Normal test A/8, 3/90

(gear wear test) is used.

In this test, it is necessary to achieve a

wear rating ≥ 10

in order to state that the pressure rating need not be reduced(DIN 51354).

Environmentally AcceptableHydraulic Fluids HETG, HEPG, HEE

for Axial Piston Units

In order to guarantee a long service life for the installation, goodand reliable filtration is necessary.

Primary prevention of in-built dirt, such as the cleaning of compo-nents, filling filters and air breathers, do not prevent a build up ofcontaminants in the system due to marginal lubrication and wearin clearances, erosion and the fatigue of rolling bearings.

The hard particle contamination of fluid may not exceed a leveldetermined by:

Class 9 to NAS 1638Class 6 to SAEClass 18/15 to ISO/DIS 4406

The required degree of cleanliness may normally be achieved bythe use of filters having a retention rate of »β20 ≥100«. In opencircuits, high pressure and/or return line filters should be usedwith all three types of fluids (see pages 3…4).

In closed circuits either a boost pressure line or boost suctionline filter should be fitted.

Due to the high density of polyglycol fluids, it must be particularlynoted, that the pressure at the suction port of the pump may notfall below the minimum permissible level.

This is of particular importance with filtration in the suction line.

Selection diagram

RA90 221/05.93

Replaces 02.92

Vis

cosi

ty v

mm

2 /s

(SU

S)

16(80)

36(170)

10 (42)

1600 (7425)

vopt.

VG 22 VI 100

VG 46 VI ???

VG 32 VI ???

VG 46 VI 200 VG 68 VI ???

Temperature t in °F (°C)

(-20)(-25)

(-10) (0) (10) (20) (30) (40) (50) (60) (70) (80) (90)(100)(110)

100 120 1400 20 40 60 80 160 180 200 220

16001000

600400

200

100

60

40

20

10

(7000)(5000)(3000)(2000)

(1000)

(500)

(300)

(150)(200)

(100)

(80)(70)

(60)

(50)

Note:In common with normal petroleum oils,

environmentally acceptable fluidsneed to be

disposed of carefully.In addition to the guide lines and notes issued by

the manufacturers, the various laws andregulations must also be observed.

RA 90 221/05.93

2

Environmentally Acceptable Hydraulic Fluids for Axial Piston Units

Notes, guidelines and permissible operating datafor the various type of environmentally acceptable hydraulic fluids.

At the present time, three types of environmentally acceptable hydraulic fluids are being offered:

1. Hydraulic fluids based on vegetable oils, type HETG (e.g. rape seed oil)2. Synthetic hydraulic fluids based on polyglycol, type HEPG (e.g. polyethyl-glycol PEG)

3. Synthetic hydraulic fluids based on esters, type HEE

Hydraulic fluids based on vegetable oils, type HETG(TG Trigliceride)

Characteristics of fluid: (as new)

• Very good viscosity/temperature characteristics

• Good lubricity

• Pour point approximately –22° F (–30° C)Care is needed when operating for long periods at very lowtemperatures. The pour point is not stable and rises quitenoticeably. Make a specific check with the manufacturer.

• Good protection against corrosion

• Easily bio-degradable

• Good compatibility with NBR and Viton seals

• Density approximately 0.92 g/ml (petroleum oil 0.87 g/ml).

• The minimum requirements to DIN 51 524, parts 2 and 3 aregenerally fulfilled. FZG load test >10 .

Aging characteristics are not fulfilled, i.e. the neutralizationnumber is not maintained £ 2.0.

Permissible operating data

In light of the above characteristics, these fluids can be used inconjunction with our axial piston units utilizing the same operatingdata as for HLP mineral oils.

The temperature range may not exceed:

0 ° to 175° F (–18° C to 80° C)

In order to prevent premature aging of the fluid, we recommendthat the tank temperature does not exceed:

not exceed 160° F (70° C)

At the present time, very little practical experience has beengathered with regard to the aging of the various fluids in this class,particularly with the ingress of water.

The water portion should be < 0.1% as to the present state ofknowledge.

The fluid must therefore be carefully monitored and changed ingood time if damage is to be avoided.

We recommend that the fluid be changed at least as frequently asshown below:

First change after 500 working hours

Second change after working 1000 hours furtheror, upon testing by the supplier, it may be run longer.However, it should then be tested every 300 workinghours and must always be changed when 2000 workinghours have been achieved .

Subsequent changes, as above.

Even where the fluid has not been run for 2000 hours, it must bechanged once per year .

Notes:

As vegetable oils are not soluble in water, and thus deposit anyaccumulated water in the tank, it is therefore advantageous if thetank has a sloping base and if a drain tap is fitted.

Conversion notes:

• In general, conversion to rape seed oil should present noproblems as it is miscible with mineral oil. However, it should benoted, that when disposing of the fluid, only the rape seed oilcontent is biologically degradable.

• The internal coating on the inside of the tank must be clarifiedwith the fluid manufacturer before converting to this fluid.

• The mineral oil should be drained from the system as completelyas possible and when it is warm (max. admissible 2% remainingoil portion).

• Any residual oil and any contamination should be removed fromthe tank by means of lint-free cleaning cloths.

• It is recommended that the system is flushed with vegetable oiland that all functions are repeatedly operated in order to removeany residual mineral oil from the system.

• The flushing fluid must then be drained from the system.

• All hydraulic filter elements must be changed (Inspect filtermaterial!)

• When filling and re-commissioning the system, please note therecommendations in RA 90 270 & 90 400.

• After a few days operation (approximately 50 hours), the filterelements should be checked and changed if necessary. This isbecause of the excellent wetting properties of vegetable oil. Itremoves deposits placed in the system by the previous use ofpetroleum oil and carries them in suspension to the filter.

RA 90 221/05.93

3

Environmentally Acceptable Hydraulic Fluids for Axial Piston Units

Synthetic hydraulic fluids based on polyglycol,type HEPG (PG polyglycol)

Characteristics of fluid: (as new)

• Very good viscosity/temperature characteristics

• Good lubricity

• Pour point approximately –40° F (–40° C)

• Good protection against corrosion

• Good shear stability

• Good resistance to aging

• Good compatibility with NBR and Viton seals

• Easily soluble in water

• Bio-degradable

• Density approximately >1 g/ml (mineral oil 0.87 g/ml).

• The minimum requirements to DIN 51 524, parts 2 and 3 arefulfilled. (FZG load test >10).

Permissible operating data

Due to the high density of this fluid, the permissible speed of selfaspirating main and auxiliary pumps in open circuits must be

reduced by 20%

Having taken this into consideration, these fluids can otherwise beused in conjunction with our axial piston units utilizing the sameoperating data as for HLP mineral oils.

Our experience up to the present time with these pumps indicatesthat they have the same aging characteristics as mineral oils. We,therefore, recommend the same intervals for changing the fluid.

First change after 500 working hours

Second change after 2000 working hours

Subsequent changes every 2000 working hours

Even where the fluid has not been run for 2000 hours, it must bechanged once per year .

Notes:

All hydraulic components are normally tested using mineral oil.They must, therefore, be completely cleaned before installation.

• Use Viton seals.

• Normal paints are attackedThe manufacturers recommend:

– No paint (the tank lid should, however, be protected with a twopart epoxy paint)

– This paint should be a two part chemical reaction hardeningpaint

– The tank should be of non-rusting material

• Not miscible with mineral oils (it can lead to solid deposits)

• Poly-carbonates, e.g. Makrolon are not resistant.Polymethacrylate, e.g. Plexidur T are resistant

• The ingress of water must be avoided. Water reduces the char-acteristics of the fluid and can only be removed by vaporization.

• Paper filter elements may not be used(use only glass fibre or metal mesh filters).

Conversion notes:

• Mineral oil should be drained from the system as completely aspossible when it is at operating temperature (max. admissible 1%remaining oil portion).

• Any residual oil and any contamination should be removed fromthe tank and any internal paint must be checked for resistance tothe fluid.

• The high density of the fluid compared with mineral oil must benoted. The minimum suction pressure at the pump may not beexceeded. This is of particular importance with suction line filters.

• All filter elements must be renewed. Only glass fibre or metalmesh filters may be used.

• Check the drive speed of the pumps. Due to the high density ofthe fluid, the maximum permissible speed of self aspiratingpumps is reduced by 20% .

• It is imperative that the system is flushed and that all functionsare repeatedly operated in order to remove any residual mineraloil from the system.

• The flushing fluid must then be drained from the system.

• When filling and re-commissioning the system, please note therecommendations in RA 90 270 & 90 400.

• As mineral oil is lighter than Polyglycol fluids, any residual oilfound floating in the tank must be scooped or sucked away.According to the manufacturers recommendations, the finalresidual quantity of petroleum oil may not exceed 1% of the totalvolume of fluid.

• After a few days operation (approximately 50 hours), the filterelements should be checked and changed if necessary. Thefilters retain any residual oil and become clogged.

In addition, because of the excellent wetting properties of thisfluid, it removes deposits placed in the system by the previoususe of mineral oil and carries them in suspension to the filter.

RA 90 221/05.93

4

Environmentally Acceptable Hydraulic Fluids for Axial Piston UnitsSynthetic hydraulic fluids based on esters,type HEE (E ester)

Characteristics of fluid: (as new)

• Very good viscosity/temperature characteristics

• Very good lubricity (FZG load test rating >10 )

• Pour point approximately –22° F (–30° C) (request themanufacturer)

• Good protection against corrosion

• Easily bio-degradable

• Good compatibility with NBR and Viton seals

• Miscible with normal mineral oils. Density approximately0.92 g/ml (mineral oil 0.87 g/ml).

• The minimum requirements to DIN 51 524, parts 2 and 3 arefulfilled.

Permissible operating data

In light of the above characteristics, these fluids can be used inconjunction with our axial piston units utilizing the same operatingdata as for HLP mineral oils.

According to the manufacturers data, the aging characteristics ofthis fluid are particularly good, but little practical experience isavailable.

We, therefore, recommend that the fluid be changed at least asfrequently as mineral oil, as shown below:

First change after 500 working hours

Second change after 2000 working hours

Further changes after every 2000 working hours

Even where the fluid has not been run for 2000 hours, it must bechanged once per year .

The water portion should be < 0.1% (attack by corrosion tononferrous metal).

Notes:

As these fluids are not soluble in water, they deposit any accumu-lated water in the tank. Therefore, it is advantageous if the tankhas a sloping base and if a drain tap is fitted.

Conversion notes:

• Use Viton seals.

• As this fluid is miscible with petroleum oil, systems may beconverted with flushing in order to reduce the residual amount ofpetroleum oil to a minimum and so reduce the non-bio-degrad-able content (max. admissible 2% remaining oil portion).

• The internal coating on the inside of the tank must be clarifiedwith the fluid manufacturer before converting to this fluid.

• All filter elements must be renewed.Only glass fibre or metal mesh filters may be used.

• In addition, it is recommended that the filter elements arechanged shortly after conversion (at the latest after 50 hoursworking) as deposits formed in the system by the previous useof petroleum oil are dissolved and carried in suspension to thefilter.

All rights reserved - Subject to revisionPrinted in U.S.A.

Mannesmann Rexroth Corporation Rexroth Hydraulics Div., Industrial, 2315 City Line Road, Bethlehem, PA 18017-2131 Tel. (610) 694-8300 Fax: (610) 694-8467Rexroth Hydraulics Div., Mobile, 1700 Old Mansfield Road, Wooster, OH 44691-0394 Tel. (330) 263-3400 Fax: (330) 263-3333

Brueninghaus Hydromatik

☛

▼

Type of fluid Vegetable oil based hydraulic fluids, Synthetic hydraulic fluids Synthetic hydraulic fluidsHETG based on Polyglycol, HEPG based on esters, HEES

ISO-viscosity VG 22 VG 32 VG 46 VG 68 VG 22 VG 32 VG 46 VG 22 VG 32 VG 46 VG 68class

Maker

Environmentally AcceptableHydraulic Fluids HETG, HEPG, HEESfor Axial Piston Units

Table of environmentally acceptable hydraulic fluids◆ tested by BHY. This does not imply that such tests were exhaustive or that a recommendation of such fluids

is implied. All rights reserved, subject to revision!

1

ADDINOL Ökoplus ÖkosynthHETG 32-68 HEES 46

AGIP Autol Autol HE46Bio HVI Arnica S22 Arnica S32 Arnica S46 Arnica S68

ARAL BAF-46 EHF 46Vitam Vitam

ASEOL Aqua Aqua Terra 15 Terra 46 Terra 68VG 32 VG 46

AUSCHEM Biofluid Biofluid Biofluid Pentaflux PentafluxITALIA FR 32 FR 46 FR 68 46 AT 68 AT

AUTOL Autol BioHVI 46

AVIA Avilub Avilub Avia Avia Avia Avia Avia Avia AviaHydraulic Hydraulic Hydrosynth Hydrosynth Hydrosynth Syntofluid N Syntofluid N Syntofluid N Syntofluid NBio 32 Bio 46 ◆ 22 32 ◆ 46 22 32 46 ◆ 68

BECHEM Bio- Hydrostar Hydrostar Hydrostar Hydrostar Hydrostar HydrostarHydraulik- UWF UWF UWF HEP HEP HEPöl 32 22 32 46 32 46 68

BINOL Hydrap46

Biostar BiostarKellersberg

BLASER BlasolLP8905

BP Biohyd 32 Biohyd 46 Biohyd Biohyd Biohyd BiohydSE-S 22 SE-S 32 SE-S 46 ◆ SE-S 68

Bremer & Leguil Rivolta RivoltaSBH 11 SBH 23

BUCHER & CIE Oekohydro Oekosynt OekosyntMOTOREX 3268 2246 3268 ◆

CASTROL Biotec ◆ Biotec ◆ CarelubeAlpin 22 HVX HES

CONDAT CONDAT CONDAT CONDATBio 32 Bio 46 Bio 68

DEA Econa Econa Econa EconaR 32 PG 32 PG 46 E 46 ◆

DELTIN DeltinolBio-Hydraulik-öl HVI 46

ELF Naturelf HydrelfHYD 38 Bio 46

RE 90221-1/12.97

RE90221-1/12.97

replaces 11.97

Environmentally Acceptable Hydraulic Fluids for Axial Piston Units

Type of fluid Vegetable oil based hydraulic fluids, Synthetic hydraulic fluids Synthetic hydraulic fluidsHETG based on Polyglycol, HEPG based on esters, HEES

ISO-viscosity VG 22 VG 32 VG 46 VG 68 VG 22 VG 32 VG 46 VG 22 VG 32 VG 46 VG 68class

Maker

◆ Tested by BHY This does not imply that such tests were exhaustive or that a recommendation of such fluidsis implied. All rights reserved, subject to revision!

☛

▼

2

ESSO Hydraulik- Hydraulik- Hydraulik- Hydraulik-öl öl öl ölPFL PGK 32 ◆ PGK 46 HE 46

EVVA- Bio-AUSTRIA Hydraulik-

öl 40

FINA Biohydran Biohydran Biohydran BiohydranRS 38 TMP 32 TMP 46 TMP 68

SE 46

FINKE Aviaticon Aviaticon HY HEHV-BD 36 22 32 46 68

FRAGOL Hydraulic Hydraulic Hydraulic Hydraulic Hydraulic HydraulicV 32 TR 22 TR 32 ◆ TR 46 HE 22 HE 46

FUCHS Plantohyd Plantohyd Plantohyd Renolin Renolin Plantolube Plantohyd Plantohyd PlantohydN 32 N 46 N 68 PGE 32 PGE 46 ◆ Polar 22S S 32 S46 S 68

Plantosyn3268 Eco

Plantosyn Plantosyn46 HVI ◆ 68 HVI ◆

GLOBOIL BHF 32 BHF 46 BHF 68

GREENOCO Greenwood Hydraulic FluidThe Green Oil 32 46 68Comp. Inc.

HESSOL HTG 37 HLP 46Bio

Houghton Trigolubric Syntolubric Syntolubric32 32 46

KAJO-Chemie Bio- Bio- Bio-Hydrauliköl Hydrauliköl HydraulikölHETG 32 HEES 22 HEES 46

KENDALL Synth.Demmler & Co NaturaSchweiz 46HV

Klöckner Deutz Oel DEUTZ OEL H-EPBio-HVI 36 32 BA 46 BA 68 BA

Kompressol UW UW500/32 500/46 Biovis

Kuwait Petroleum Holbein HolbeinQ8 32 46

Lubricating LD Bio-Hydresther HVIDutchman 32 46 68

Leprince-Siveke Leprinxol BSE Hydrosynt46 68

Lubrizol TH92451

RE 90221-1/09.97

☛

▼

Environmentally Acceptable Hydraulic Fluids for Axial Piston Units

Type of fluid Vegetable oil based hydraulic fluids, Synthetic hydraulic fluids Synthetic hydraulic fluidsHETG based on Polyglycol, HEPG based on esters, HEES

ISO-viscosity VG 22 VG 32 VG 46 VG 68 VG 22 VG 32 VG 46 VG 22 VG 32 VG 46 VG 68class

Maker

◆ Tested by BHY This does not imply that such tests were exhaustive or that a recommendation of such fluidsis implied. All rights reserved, subject to revision!

3

MOBIL EAL EAL Syn-224 H draulic 46

◆HydraulicOil UF 46◆

MOBIL/USA Envirosyn Envirosyn Envirosyn32 H 46 H 68 H

◆

MOL RT Biokom Biokom BiokomUngarn HID 32 HID 46 HID 46S

Molyduval Chem-lube 5126

ÖMV Biohyd Biohyd Biohyd Biohyd Biohyd Biohyd Biohyd BiohydM 15 M 32 M 46 M 68 MT 32 MT 46

MS 15 MS 32 MS 46 ◆ MS 68

OEST Bio- BioHydraulik- Synth.öl HVI 34 HYD 46

OPTIMOL HYDO HYDOBS 46 BS 68

PANOLIN, HLP HLP HLP HLPSchweiz Synth Synth Synth Synth

15 32 ◆ 46 ◆ 68

Quaker Greensave Green-Chemical N 30 save 46

RAISION Raisio Raisio Raisio RaisioFinland Bio Safe Bio Safe Bio Safe Bio Safe

32 NE ◆ 68 NE 46 SE 68 SE

Reiner Eco-HYD Eco-HYD Eco-HYD Eco-HYD Eco-HYD Eco-HYDChemische 32 N 46 N 68 N 32 S 46 S 68 SFabrik GmbH S Plus ◆

SHELL Naturelle Fluid Fluid Fluid Naturelle NaturelleHF-R32 ◆ BD 22 BD 32 ◆ BD 46 HF-E 46 HF-E 68

Sollner ConnexolHD 32-68

Strub & Co Hydrosint Hydrosint HydrosintSchmiertechnik HLP HLP HLPCH-Reiden ISO 32 ISO 46 ISO 68

STL ColzecFrance TRF

Stuart Hydrocor ISOCOR ISOCORE 46 HF 46 HF 68ISOCOR ISOCORE46 HF 2000

TAMOIL Green Hydro Safety32 46 68

Texaco Biostar Hydraulic Synstar Hydraulic32 46 32 46

RE 90221-1/11.97

Environmentally Acceptable Hydraulic Fluids for Axial Piston Units

Type of fluid Vegetable oil based hydraulic fluids, Synthetic hydraulic fluids Synthetic hydraulic fluidsHETG based on Polyglycol, HEPG based on esters, HEES

ISO-viscosity VG 22 VG 32 VG 46 VG 68 VG 22 VG 32 VG 46 VG 22 VG 32 VG 46 VG 68class

Maker

◆ Tested by BHY This does not imply that such tests were exhaustive or that a recommendation of such fluidsis implied. All rights reserved, subject to revision!

☛

▼

4

TOTAL Equivis EquivisBio 46 Bio 68

Tribol Bio Top Bio Top Bio Top1448/32 1448/46 1448/68

VALVOLINE Ultraplant Ultrasyn Unisyn Unisyn40 PG 46 HLP 22/46 HLP 32/68

WESTFALEN Bio- Bio- Bio-AG Forbex Forbex Forbex

R 32 R 46 E 46

Wintershall WiolganHR 32

WISURA HydromaNAT 40

YORK York 777 York 777Ginouves Bio VG 32 Bio VG 46

Zeller & Gmelin Divinol DivinolHTG 46 HE 46

RE 90221-1/11.97

Guarantee of correct operation of hydrostatic installations

Environmentally acceptable hydraulic fluids to RE 90 221

This guarantee is limited to the supply of suitable materials and correct functioning of the itemssupplied.

Requirements:

- The fulfilment of the minimum requirements of DIN 51 524, parts 2 and 3 ( FZG ≥ 10)(this is only partially fulfilled by vegetable oil based fluids).

- Maintenance of the correct viscosity limits

- Operation within the limits set by the technical data with respect to the fluid characteristics(e.g. density, the compatibility of the fluid with paints, filter materials and seals).

- Maintenance of the correct degree of fluid cleanliness

- Regulated maintenance of the installation and changing the fluid at the intervalsrecommended by the manufacturer and at least as often as laid down in publicationRE 90 221.

This guarantee is limited to 6 months after commissioning or 9 months after the supply ofthe units, whichever is the shorter .

Where not otherwise stated, our standard terms and conditions apply.

All rights reserved - Subject to revisionPrinted in U.S.A.

Mannesmann Rexroth Corporation Rexroth Hydraulics Div., Industrial, 2315 City Line Road, Bethlehem, PA 18017-2131 Tel. (610) 694-8300 Fax: (610) 694-8467Rexroth Hydraulics Div., Mobile, 1700 Old Mansfield Road, Wooster, OH 44691-0394 Tel. (330) 263-3400 Fax: (330) 263-3333