Sandvik
HYD MOTOR 550 065 21 / 55006521 — Sandvik Compatible
HYD MOTOR is a high-strength aftermarket spare part fully compatible with Sandvik hydraulic drifters and rock drills. Precision CNC-machined to original-part tolerances. Contact us for stock and delivery on OEM number 550 065 21.
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HYD MOTOR — OEM 550 065 21 / 55006521
- OEM Number
- 550 065 21
- Also written as
- 55006521
- Compatible Brand
- Sandvik
- Part Type
- Drifter
What the HYD MOTOR does
The hydraulic motor drives rotation of the drill string. It has to deliver useful torque at low speed in hard rock and to tolerate the reactive shock that comes back up the string every time the bit bites unevenly.
Signs it needs replacing
- Rotation speed or torque below normal at correct pressure and flow
- Shaft seal leaking at the motor's drive end
- Case drain flow above the machine's stated limit — the standard sign of internal wear
- Rotation that only weakens once the oil is hot
Before you fit it
Measure case drain flow before condemning a motor; it separates a worn motor from a supply problem upstream. Flush the circuit if the motor failed with debris, or the new unit will ingest it.
General guidance for this class of component. Always work to the torque figures, clearances and service intervals in your machine's own manual.
About This Part
Which machines does HYD MOTOR (OEM 550 065 21) fit?
It is used on Sandvik hydraulic rock drills and drifters. Models we already carry parts for: HL1560 ROCK DRILL (DRIFTER), HL300 ROCK DRILL (DRIFTER), HL710 ROCK DRILL (DRIFTER), HL820T ROCK DRILL (DRIFTER), RD314 ROCK DRILL (DRIFTER), RD525 ROCK DRILL (DRIFTER). If yours is not listed, send us the OEM number and we will confirm the fit.
How should I write the OEM number?
This part number is written two ways: 550 065 21 (spaced) and 55006521 (unspaced). Both refer to the same part, and the site search finds either spelling.
Is this an original Sandvik part?
No. This is an aftermarket part manufactured by KY Rock Drill and CNC-machined to original-part tolerances. We are not affiliated with or an authorised dealer for Sandvik; the OEM number is quoted only to identify compatibility.
