SCIENTIFIC CASE STUDY|HYDRAULICS AND HYDRAULIC DRIVES|HYDRAULIC MOTORS · TEST-BENCH TRIALS

TEST-BENCH TRIAL REPORT, NII GIDROPRIVOD JSC

Hydraulic motor 410.56: less friction and leakage with no machine teardown

Research and Design Institute of Industrial Hydraulic Drives and Hydraulic Automation JSC — "NII Gidroprivod" · approved by: Deputy Director for R&D, PhD (Eng.) G. A. Avrunin

Kharkiv, Ukraine · trials 23.05–30.05.2001, operating time 28.2 h · report approved 25.09.2001

PRODUCTXADO technology®"XADO compound" — the wording of the 2001 original; added to the working fluid of the test bench hydraulic system

TEST OBJECTHydraulic motor 410.56axial-piston, connecting-rod kinematics, face-type distribution · displacement 56 cm³ · Stroygidravlika OJSC, Odesa

DOCUMENT TYPETrial report
of NII Gidroprivod JSCfive signatories, seals of the institute and of XADO LLC

Key results

↓3.4×

pressure drop across the hydraulic motor, 12 → 3.5 kgf/cm²

↓26%

external leakage of the working fluid, 500 → 370 cm³/min

TEST OBJECT	CONDITION BEFORE TREATMENT	WHAT WAS MEASURED
Hydraulic motor 410.56, displacement 56 cm³	Run in before the compound was added, readings stable; scuffing marks and scratches on the distributor surface	Pressure drop between inlet and outlet, external leakage of the working fluid

Pressure drop between hydraulic motor inlet and outlet — by operating time

OPERATING TIME	DATE OF MEASUREMENT	INLET PRESSURE P1	PRESSURE DROP ΔP
0 h	23.05.2001	62 kgf/cm²	12 kgf/cm²
4.6 h	24.05.2001	58 kgf/cm²	8 kgf/cm²
11.1 h	25.05.2001	55 kgf/cm²	5 kgf/cm²
16.2 h	28.05.2001	54 kgf/cm²	4 kgf/cm²
22.4 h	29.05.2001	53.5 kgf/cm²	3.5 kgf/cm²
28.2 h	30.05.2001	53.5 kgf/cm²	3.5 kgf/cm²

Outlet pressure P2 was 50 kgf/cm² in every measurement, rotation speed 110-118 rpm, readings taken at the morning start-up; pressure gauges of accuracy class 1.6.

External leakage of the working fluid at 60 °C

MEASUREMENT	DATE AND TIME	LEAKAGE Q
First	23.05.2001, 11:23	500 cm³/min
Last	28.05.2001, 9:55	370 cm³/min

18 measurements over the working days of 23.05-28.05.2001 at a fixed working-fluid temperature of 60 °C.

Conclusion of the institute

Following the bench trials, NII Gidroprivod JSC recorded: "The measurement results indicate a reduction of the pressure drop by 71% (from 12 kgf/cm² to 3.5 kgf/cm²). Leakage decreased by 26% (from 500 cm³/min to 370 cm³/min)". The effect of XADO technology on the hydraulic motor is confirmed by the reduced leakage of working fluid and the reduced friction losses inside the mechanism; "the friction pairs of the hydraulic motor have the appearance of smooth ground surfaces; the scuffing marks and scratches found on the distributor surface during preparation for the trials are no longer observed". As a consequence of the changes described above, the volumetric efficiency of the unit and the mean time between failures increase. The institute recommends the use of XADO technology for preventive repair of hydraulic equipment and for extending intervals between overhauls.

The results relate to the axial-piston hydraulic motor 410.56 with a displacement of 56 cm³ on the test bench of NII Gidroprivod JSC; with other machines and operating modes the figures may differ. The trials were carried out by a joint engineering team of the institute and XADO LLC. The original report with signatures and seals is published in full and available for download.

Current equivalent

Revitalizant gel for hydraulic systems →

Hydraulic systems of industrial and special equipment, pumps, motors and valves; gearboxes with oil filtration.

How such units are treated: Hydraulic system

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