BMSY Disc Valve Orbital Hydraulic Motor 80-630 Cc/Rev

BMSY Hydraulic Motor Overview

The BMSY hydraulic motor is a disc valve orbital motor in ten nominal displacements, BMSY80 through BMSY630, with catalogue continuous torque of 195–1063 Nm. Standard flange, wheel mount and bearingless hydraulic motor builds are manufactured and supplied EXW Hebei, China.

Every quotation is matched to a confirmed drawing and order code. The catalogue summary table is for first comparison only, and final selection follows our written confirmation of your combined duty point.

• Nominal sizes: 80, 100, 125, 160, 195, 245, 305, 395, 490 and 630 cc/rev
• Continuous pressure: 170 bar (80–245), 140 bar (305, 395), 130 bar (490, 630)
• Reference source: Olive Branch Hydraulics catalogue pp. 107–116 (PDF pp. 109–118)

Disc Valve Orbital Motor Construction and Key Features

Five-piece body. Disc valve distribution. Roller stator–rotor set.

• Disc (end-face) valve distribution: oil is timed through a flat valve disc at the motor end, not through a spool on the output shaft.
• Roller stator–rotor set: rollers seated in the stator contact the rotor lobes, giving rolling contact in place of sliding contact at the gerotor.
• Five-piece construction: the catalogue identifies a five-piece body; confirm the selected assembly drawing.
• Heavy-duty tapered roller bearings: fitted on bearing-equipped builds (standard and wheel mount) to carry shaft loads.
• Bearingless build: no motor bearings, spline A17 (12 teeth, 12/24 DP, 30°), external bearing support required, no brake rating published.
• Rotation: A in / B out gives clockwise rotation viewed facing the shaft; reversing the flow reverses the rotation.
• Shaft, port and drain: supplied per the catalogue drawing and your confirmed order code, with no unannounced substitutions.

The bearingless version shortens the drive package. The trade-off is that the gearbox or hub must take all radial and axial loads.

BMSY80–BMSY630 Technical Specifications

Selection comes down to four checks: continuous torque, continuous pressure, speed at your available flow and duty cycle. Intermittent values apply for no more than 6 seconds in any minute, and maximum speed and maximum pressure are never rated as a simultaneous combination.

Catalogue Performance Summary (Nominal, Continuous / Intermittent)

• BMSY80 (80 cc/rev): 75/75 L/min; 799/908 rpm; 170/275 bar; 195/305 Nm
• BMSY100 (100 cc/rev): 75/95 L/min; 742/924 rpm; 170/275 bar; 245/395 Nm
• BMSY125 (125 cc/rev): 75/95 L/min; 576/720 rpm; 170/275 bar; 315/550 Nm
• BMSY160 (160 cc/rev): 75/115 L/min; 477/713 rpm; 170/275 bar; 380/530 Nm
• BMSY195 (195 cc/rev): 75/115 L/min; 385/577 rpm; 170/240 bar; 455/625 Nm
• BMSY245 (245 cc/rev): 75/115 L/min; 308/462 rpm; 170/240 bar; 555/765 Nm
• BMSY305 (305 cc/rev): 75/115 L/min; 246/365 rpm; 140/205 bar; 560/805 Nm
• BMSY395 (395 cc/rev): 75/115 L/min; 191/265 rpm; 140/170 bar; 700/890 Nm
• BMSY490 (490 cc/rev): 75/115 L/min; 153/230 rpm; 130/150 bar; 838/956 Nm
• BMSY630 (630 cc/rev): 75/115 L/min; 112/168 rpm; 130/150 bar; 1063/1228 Nm

Data Limits to Check Before Selection

• Performance curves on pp. 108–109 differ from the summary table. For example, the BMSY80 curve shows 65/80 L/min against 75/75 in the summary, along with different pressures.
• We confirm the governing value in writing and never round a rating upward.
• 310 bar is a transient peak. It is not a continuous rating and not a back-pressure rating.
• Seal data cites 175 bar case pressure and a 200 bar return peak. Both depend on speed and drain configuration and are confirmed for each build.
• Recommended maximum system temperature is 82 °C.
• The mount drawing on p. 110 labels sizes 315 and 475, while the performance table lists 305 and 490. These are not treated as equivalent.
• The bearingless table on p. 115 lists 305 and 490.
• BMSY630 dimensions are absent from the drawing and order table. They are issued only from a confirmed drawing.

Model Code Formats and Search Terms

Model search spellings: BMSY80 / BMSY 80 / BMSY-80; BMSY100 / BMSY 100 / BMSY-100; BMSY125 / BMSY 125 / BMSY-125; BMSY160 / BMSY 160 / BMSY-160; BMSY195 / BMSY 195 / BMSY-195; BMSY245 / BMSY 245 / BMSY-245; BMSY305 / BMSY 305 / BMSY-305; BMSY395 / BMSY 395 / BMSY-395; BMSY490 / BMSY 490 / BMSY-490; BMSY630 / BMSY 630 / BMSY-630. These are nominal size aliases, not complete order codes. BMSY315 and BMSY475 are printed drawing references requiring separate confirmation, not verified aliases for 305/490. No OEM material-number cross-reference is verified on this page.

Equivalent search terms are motor hidráulico orbital BMSY and motor orbital con válvula de disco (ES), moteur hydraulique orbital BMSY and moteur orbital à distributeur à disque (FR), and гидромотор BMSY and орбитальный гидромотор с торцевым распределением (RU).

Applications and Equipment Selection

Augers, conveyors and wheel drives place different loads on the same displacement. The table below is a first filter by catalogue torque. Exact machine compatibility requires a full configuration review.

Equipment	Typical BMSY Build	Catalogue Starting Point	Confirm Before Ordering
Conveyors	Standard mount	Size by continuous torque at line speed	Start/stop frequency, duty cycle, drain routing
Augers	Standard mount	395–630 cc list 700–1063 Nm continuous	Stall and shock events against the 6 s/min intermittent limit
Rotary attachments	Standard mount	125–245 cc list 315–555 Nm continuous	Reversing frequency, back-pressure, case pressure
Engineered wheel drives	Wheel mount	Size by wheel torque and travel speed	Radial load, hub interface, 315/475 drawing labels
Bearingless gearbox drives	Bearingless	Sizes per p. 115 bearingless table	External bearing, A17 spline mating and any separately engineered load-holding system

Mechanical interfaces and catalogue differences

The gallery contains the complete P107–P116 source pages. Photos illustrate a standard keyed-shaft family configuration, not every size, wheel mount or bearingless version. Use the selected shaft, flange, port and drain codes together with an approved drawing.

Mounting options

F1 is the two-hole elongated flange, F2 the four-hole square flange, F3 the four-hole elongated flange, and F4 the 120 mm square flange with a 100 mm pilot and four 13 mm holes. F5 is the six-hole elongated flange. F1/F2/F3/F5/F6 use an 82.5 mm nominal pilot in the order table, but pilot projection and hole geometry differ. F6 is a smaller square flange with four 11.5 mm through-holes on a 106.4 mm bolt circle in the drawing. F2 is labelled 105×105 in the order table while its drawing shows 106.4 mm centres: confirm the final hole pattern rather than treating these figures as identical.

F7 is the wheel flange: nominal 125 mm pilot, four 13.5 mm holes on a 160 mm bolt circle. F8 is a two-hole elongated flange with 11 mm holes at 109 mm centres. F9 is the larger two-hole flange with a 101.6 mm pilot, 14.3 mm holes and 146.05 mm centres. F10 is the round bearingless flange, 100 mm pilot, four 11 mm holes on a 125 mm bolt circle. F11 is the square bearingless flange, 101.6 mm pilot, four 13.5 mm holes on a 127 mm bolt circle. The complete drawings govern tolerances and orientation.

Dimensions: preserve the printed size labels

The P110 standard and wheel tables label sizes 315 and 475, whereas the P107 performance table uses 305 and 490. The P115 bearingless tables and P116 order table use 305 and 490. These labels are not confirmed equivalents. No 630 mounting dimensions or 630 order-table entry is supplied here; request an approved 630 drawing.

P110 printed size	H	Standard L	Wheel L (mm)
80	14.4	166	136
100	17.8	169	139
125	22.5	174	144
160	28.9	181	150
195	35.6	187	158
245	44.6	196	167
315	44.6	196	167
395	56	180	192
475	68	192	204

H and L are the labels on the source drawings, not universally interchangeable overall-length definitions. The standard 395/475 L values are shorter than some smaller-size entries, so the table must not be used to infer an unconfirmed envelope. P115 bearingless printed sizes 80/100/125/160/195/245/305/395/490 have L 122/124/129/136/142/151/151/163/179 mm respectively. Confirm the full assembly and shaft projection separately.

Shaft selection

Keyed examples include A1 Ø25 mm, A2 Ø32 mm with a 10×8×45 key, A3 Ø25.4 mm with a 6.35×6.35×32 key, A5 Ø31.75 mm with a 7.96×7.96×31.75 key and A9 Ø30 mm with a 10×8×45 key. A1 is drawn with an 8×7×32 key on P112, while the order table prints 8×7×28; confirm the engagement length. A6 and A8 are 14-tooth 12/24 DP, 30° involute splines with different end threads; A15 is a different 13-tooth 16/32 DP spline. Rectangular spline drawings A4/A10/A11/A14/A16 differ in tooth dimensions or projection; a shared tooth count does not establish a fit.

A12 uses a nominal Ø35 mm taper 1:10, key 6×6×20 and M20×1.5 end thread. A13 instead uses a Ø31.75 mm taper 1:8, 7.96 mm square key and M24×1.5 end thread. The P113 200±10 Nm tightening value belongs only to the illustrated A13 shaft nut, not flange bolts or all shaft types. Bearingless A17 is a 12-tooth 12/24 DP, 30° spline; it is not the 14-tooth standard shaft. The host gearbox or hub must carry the shaft loads and provide the required lubrication arrangement.

Main ports and case drain

P1/P6/P10 use G1/2 main ports; P2/P5/P11 use M22×1.5; P3/P7/P12 use 7/8-14 UNF O-ring ports; P4 uses 1/2 NPT. P1–P4 show a two-M10 face connection pattern, P5–P7 a different three-M10 pattern, and P8/P9 two Ø13 open ports with a three-M10 pattern. P13/P14/P15 show four-port arrangements using G1/2, M22×1.5 or 7/8-14 UNF respectively. P16 is a special rear/side port arrangement with separate front drain: confirm the actual main-thread description and port allocation against the drawing, since the order-table wording differs.

Case-drain options include G1/4, M14×1.5 and 7/16-20 UNF depending on the port code. A mounting-bolt thread is not the main fluid-port thread. Agree the seal form, thread depth, return pressure and external drain before installation.

Related products: compare the independently specified BMV disc valve motor and BMT orbital motor. Similar names or nominal displacement do not establish interchangeability.

OEM/ODM, Private Label and Wholesale Supply

MOQ, lead time and sample terms are quoted for each configuration. Small trial orders are accepted.

1. You send your requirement: drawing, order code or the nameplate of the existing motor.
2. We match the configuration against the catalogue drawing and order code.
3. We issue a written combined-duty confirmation and an EXW Hebei quotation.
4. We build a sample or trial order for your fit and function test.
5. You approve the configuration, and batch production follows on the same code.
6. Goods are handed over EXW Hebei with order-specific documents.

OEM/ODM Configuration

• Options cover mount type, shaft, port and drain within catalogue codes, plus nameplate marking and packaging.
• Drawings can be submitted as PDF or CAD files. NDA terms can be agreed before files are shared.

Private Label and Retail-Ready Packaging

• We supply white-label units with your brand on the carton and label.
• Request barcode, label, packed-weight and carton-size details in your RFQ; available arrangements are confirmed in the quotation.

Wholesale, Distributors and Project Buyers

• Quantity-break pricing is quoted against your size mix. Mixed-size orders across the BMSY range can be quoted together.
• For distributor applications, send your territory, target sizes and annual volume. Agreed terms are confirmed in writing.
• Factory inspection in Hebei is available before or during your order.

FAQ

Is the catalogue summary table enough to select a BMSY size?

No. It is an initial comparison only, because the pp. 108–109 curves differ from it, so we confirm your combined duty point in writing before selection.

Can a BMSY motor run at maximum speed and maximum pressure together?

No. The catalogue does not rate that combination, and intermittent values are limited to 6 seconds per minute.

Is BMSY315 the same as BMSY305, or BMSY475 the same as BMSY490?

No equivalence is confirmed. The 315 and 475 labels on the p. 110 drawing must be checked against the 305 and 490 performance sizes before any selection.

Are BMSY630 dimensions available?

Only from a confirmed drawing. The 630 size is not shown on the catalogue mount drawing or order table, and we do not estimate its dimensions.

Will a BMSY motor directly replace another brand's orbital motor?

Not automatically. Send the original nameplate and drawing so we can compare the full code, mounting, shaft, sealing, ports, drain, rotation, circuit, loads and rated duty before approving any replacement.

What does the bearingless BMSY motor require?

It requires an external bearing in the gearbox or hub, and the shaft uses spline A17 (12 teeth, 12/24 DP, 30°). No brake rating is published for this build.

Which direction does the motor turn?

Clockwise viewed facing the shaft with A as inlet and B as outlet. Reverse the flow for counter-clockwise rotation.

Is BMVS part of the BMSY series?

No. BMVS belongs to the BMV series and is quoted separately.

What quality documents do you supply?

We supply order-specific documents verified for your shipment. Factory inspection in Hebei is available on request.

Request a BMSY Motor Quote

1. Size and mount type: standard, wheel mount or bearingless.
2. Duty point: flow, pressure, speed, torque and the continuous/intermittent share.
3. Shaft, port and drain codes, or your drawing.
4. Case and return pressure, drain routing and oil temperature.
5. Nameplate or drawing of the motor being replaced.
6. Quantity per size, packaging or label needs, and destination.

Send these six items and we return a factory-direct EXW Hebei quotation with written duty confirmation, sample terms and lead time for your configuration.