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Specifications
| Model |
Displacement in3/rev(cm3/rev) |
Gear Width
in (mm) |
| 15YB |
.146 (2,39) .25 |
(6,4) |
| 22YB |
.219 (3,59) .37 |
(9,5) |
| 29YB |
.293 (4,80) .50 |
(12,7) |
| 43YB |
.439 (7,20) .75 |
(19,1) |
| 58YB |
.586 (9,61) 1.00 |
(25,4) |
| 73YB |
.732 (12,00) 1.25 |
(31,8) |
 Note: Theoretical pump delivery in gpm (l/min) is determined by multiplying displacement in3/rev (cm3/rev) by desired pump rpm and dividing by 231 (1000).
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YB Series hydraulic gear pumps are ideally suited for applications where a lightweight, compact and sturdy unidirectional pump is required. Operating at continuous pressures to 2000 psi (138 bar) and speeds to 4000 rpm, YB Series pumps are available in six displacements from .15 to .73 in3/rev (2 to 12 cm3/rev).
YB pumps feature a pressure-balanced design for high volumetric and mechanical efficiencies. They have two-piece, high-strength aluminum alloy construction with heat-treated gears and shafts. Standard features include straight keyed or tang shafts; heavy-duty needle bearings, double-lip nitrile rubber seals, and side SAE O-ring or NPTF type ports. A standard universal mounting flange adapts easily to 2/4-bolt ìAAî configurations. Options include a 2-bolt ìAAî mounting flange; end porting and mechanical, high-pressure or fluoroelastomer seals. Relief and/or outlet check valves are also optional.
 Download Full Specifications Here
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Operating Pressures
| 15YB |
to 2500 psi (172 bar) continuous |
| 22YB |
to 2000 psi (138 bar) continuous |
| 29YB |
to 2000 psi (138 bar) continuous |
| 43YB |
to 2000 psi (138 bar) continuous |
| 58YB |
to 2000 psi (138 bar) continuous |
| 73YB |
to 2000 psi (138 bar) continuous
to 2500 psi (172 bar), intermittent |
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| Recommended
Operating Speeds |
To 4000 rpm.
See catalog specification sheets.
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| Mounting |
2/4-bolt integral combination mount. SAE 2-bolt “AA”, optional. |
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| Shafts |
.562” (14,27 mm) diameter straight keyed shaft, tang shaft, standard. Other shafts available upon request. |
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| Shaft Rotation |
Clockwise. (Right hand)
Counterclockwise. (Left hand)
(When viewed from shaft end) |
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| Seals |
Nitrile rubber standard. Mechanical, high pressure, double lip or fluoroelastomer seals, optional. |
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| Bearings |
Four heavy-duty needle type. Five with optional outboard bearing. |
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| Porting |
SAE O-ring and NPTF side location, standard. End or combination location, optional. |
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| Optional Valving |
*Internally drained relief valves (15YB-29YB). Externally drained relief valves (43YB-73YB). Outlet check valves (15YB-29YB). |
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| Weight |
1.75 to 3 pounds. (0,8 to 1,3 kg). |
| *Internally drained relief valve is an overload relief only. It should not be used to regulate system pressure. |
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