IE B045TECHNICAL ACT ON HYDRAULIC MOTOR RESTORATION · OCTOBER 2001
Marine hydraulic motor A2F: friction pairs restored without replacing parts
Oil bypass through friction pairs fell, restoration cost less than a conventional repair. 3.6× — oil leakage through the precision pairs, 21.7 → 6 l; 2.9× — cost of restoring the hydraulic motor, 300 → 102 lats (2001).
of a three-party commissionSIA “SimSS AUTO” · SIA “A.S.V.” · SIA “TERRANOVA”
Key results
| 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
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:
About this result:
Limits of this report: 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”.