INDUSTRIAL CASE STUDY|SHIPPING|HYDRAULICS · HYDRAULIC MOTORS
TECHNICAL ACT ON HYDRAULIC MOTOR RESTORATION · OCTOBER 2001
Marine hydraulic motor A2F: friction pairs restored without replacing parts
PRODUCTXADO technologytreatment in three stages, formula 2+3+2 tubes, one stage every 8 h of unit operation
TREATED UNITHydraulic motor, type A2Ftanker "NATA" · precision pairs, cylinder-piston group, cylinder block face, valve plate, bearing
DOCUMENT TYPETechnical act
of a three-party commissionSIA "SimSS AUTO" · SIA "A.S.V." · SIA "TERRANOVA"
of a three-party commissionSIA "SimSS AUTO" · SIA "A.S.V." · SIA "TERRANOVA"
Key results
↓3.6×
oil leakage through the precision pairs, 21.7 → 6 l
↓2.9×
cost of restoring the hydraulic motor, 300 → 102 lats
| EQUIPMENT | CONDITION AT THE START OF WORK | WHAT WAS MEASURED |
|---|---|---|
| Hydraulic motor A2F,<br/>tanker "NATA" | Severe wear of the precision pairs and the cylinder-piston group: deep pits, scuffing and scratches; bearing noise when rotating; oil seal missing | Oil leakage on the test bench, condition of the working surfaces at disassembly |
Oil leakage through the precision pairs and the cylinder-piston group
| STAGE OF WORK | RUNNING TIME ON THE BENCH | OIL LEAKAGE |
|---|---|---|
| Before treatment | — | 21.7 l in 30 min |
| After the first treatment stage | 18 h | 7 l in 30 min |
| After the full treatment cycle | 60 h | 6 l |
| Grinding of the cylinder block face and the valve plate, then treatment | 75 h | 5.4 l |
The grinding was carried out at the customer's request as a separate experiment; the act recommends it as surface preparation for bench restoration.
Condition of the working surfaces at disassembly
| COMPONENT | BEFORE TREATMENT | AFTER THE FULL TREATMENT CYCLE |
|---|---|---|
| Precision pairs | Deep pits, scuffing and scratches | Pits and scratches have practically disappeared, the surface is even and smooth |
| Cylinder block face, valve plate | Severe wear, deep pits | Metal-ceramic layer at the points of closest contact between the parts |
| Cylinders and pistons | Wear, scratches on the cylinder walls | The surface feels perfectly smooth; a metal-ceramic layer on the pistons, most pronounced in the upper, most heavily loaded part |
| Bearing | Noise when rotating | No noise audible |
Inspection by the commission at partial disassembly after 40 h and at full disassembly after 60 h of operation on the bench.
Conclusion of the commission
The three-party commission of SIA "SimSS AUTO", SIA "A.S.V." and SIA "TERRANOVA" recorded: treatment of the hydraulic motor with XADO technology without disassembling it, under normal operating conditions, gives an absolute positive effect. The unit arrived for fault detection with severe wear of the precision pairs and the cylinder-piston group — deep pits, scuffing, scratches; after 60 h of treatment the pits and scratches had practically disappeared, a metal-ceramic layer is observed at the points of closest contact between the parts, and the bearing noise is no longer audible. Conclusion of the act: "The motor is ready for operation in normal mode." For bench restoration the commission recommends grinding the surfaces to be treated beforehand, excluding the cylinder-piston group and the bearings. The economic effect is evident: conventional repair of the hydraulic motor costs 300 lats, restoration with XADO technology cost 102 lats, the saving amounted to 66 %.
The results relate to a marine hydraulic motor of type A2F restored on a test bench for the repair of hydraulic systems; with other units and under other conditions the figures may differ. The treatment was performed and the restoration cost calculated by SIA "SimSS AUTO". The original technical act is published in full and available for download.
Current equivalent
- Revitalizant gel for hydraulic systemsHydraulics · pumps · hydraulic motors
- Revitalizant gel for cylinder restorationEngine cylinders, deep wear
- Revitalizant gel for compressors and bearingsCompressors · bearings · spindles
How such units are treated: