OM-261050 Page 29
Obtain hoses of the proper length and type with appropriate fittings for the installation according to Table 7-1.
Table 7-1. Hydraulic Hoses Specifications
Hydraulic Hoses System Flow Rate Hose ID Minimum
Working
Pressure
Minimum
Burst
Pressure
Vacuum Service Operating
Temperature
in. / mm psi / MPa psi / MPa Inches of Hg / kPa Degree C
Suction Line
1
up to 10 gpm 1.25 / 31.76 150 / 1.03 600 / 4.14 28 / 94.82 −40 to 100
over 10 gpm, up to 20 gpm 1.5 / 38.1
Pressure Line
2
up to 10gpm 0.5 / 12.7 3000 / 20.68 12000 / 82.74 −40 to 100
over 10 gpm, up to 20 gpm 0.75 / 19.05
Case Drain
3
All flow rates 0.625 / 15.88 350 / 2.41 1400 / 9.65 −40 to 100
Load Sense
(Closed Center)
4
All flow rates 0.25 / 6.35 3000 / 20.68 12000 / 82.74 −40 to 100
Return Line Less
Than 10 gpm
5
up to 10 gpm 0.625 . 15.88 −40 to 100
over 10 gpm, up to 20 gpm 0.75 / 19.05
1 − Based on 2−4 fps velocity. Sweep elbows required. Barbed fittings acceptable with two hose clamps. Connection: JIC (37°)−24,
1-7/8−12 thread, torque 160 ft. lb.
2 − Based on 15−20 fps velocity. Connection: JIC (37°)−12, 1−1/16 −12, torque 80 ft. lb.
3 − Based on 2 gpm with a pressure drop of less than 10 psi and length less than 10 ft. Connection: JIC (37°)−10, 7/8−14, torque 60 ft. lb.
4 − Applicable only to closed−center system. Connection: JIC (37°)−4, 7/16 −20, torque 12 ft. lb.
5 − Based on 10−15 fps velocity. The line should connect directly back to reservoir through a return filter. Filter cleanliness code: 18/16/13
or better.
E. Filtration
System filtration requirements are to maintain a cleanliness code of 18/16/13 per ISO 4406:1999.
Filtration should be met with the use of a return line filter. Per the pump manufacturer, the use of suction line strainer is not recommended due to clogging
issues.
The filter must be compatible with all petroleum and synthetic hydraulic fluids. The filter should operate in a temperature range of −30°C to 121°C.
Consideration should be given to the filter bypass rating. Excessive bypass at low temperatures should be avoided.
F. Hydraulic Fluid
Premium grade petroleum−based fluid that contains anti−wear agents, rust inhibitors, anti−foaming agents, and oxidation inhibitors and has an ISO VG
rating as recommended.
Table 7-2. Hydraulic Fluid Specifications
NOTICE − Viscosity Index (VI) greater than 120 is recommended.
Ambient Temperature Viscosity Grade (Viscosity Index Greater Than 120)
0° F to 90° F (−18° C to 32° C) ISO 32
Less than 0° F (less than−18° C) ISO 15
Greater than 90° F (greater than 32° C) ISO 46
General fluid recommendations:
Recommended operating viscosity: 16−40 cSt
Maximum continuous viscosity: 430 cSt
Maximum start−up viscosity: 2100 cSt
Minimum intermittent viscosity: 6 cSt
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