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The document describes the Hydro-Gear 310-1500/310-1700 Integrated Hydrostatic Transaxle, a self-contained, compact, and efficient drive system for lawn and garden equipment. These transaxles are designed to provide infinitely variable speed range in both forward and reverse modes of operation, making them suitable for various applications.
The Hydro-Gear 310-1500/310-1700 series transaxles integrate a hydraulic pump, a hydraulic motor, and a gear reduction unit into a single housing. The system operates on a closed-loop principle, where fluid is drawn from an internal reservoir and fed to a fixed displacement gerotor charge pump. Excess fluid in the charge circuit is discharged over the charge relief valve and dumps back to the case. Check valves in the center section are used to control the makeup flow of the fluid to the low pressure side of the loop.
The input shaft and pump cylinder block are turned in one direction by the engine/drive belt/pulley combination. The output of the oil flow is controlled by the direction and amount that the swashplate is angled. As the pump pistons compress, they force the oil to flow through one of two passageways (forward or reverse) in the center section and motor block. The motor has a fixed displacement angle, and the swashplate is increased, the amount of oil being pumped will increase and cause a higher RPM output of the motor. Reversing the angle of the pump swashplate will reverse the direction of oil flow.
The motor cylinder block mounts onto the splined motor shaft, which drives the planetary differential/gear reduction assembly. The bypass feature allows the transaxle to be moved for short distances at a maximum speed of 2 m.p.h. (3.2 km/hr) without starting the engine. Actuating the bypass will result in the loss of hydrostatic braking capacity, and the machine must be stationary on a level surface and in neutral when actuating the bypass. The -1500/-1700 series transaxles utilize an in-line floating disc brake controlled by a "cam" style actuating arm.
The technical specifications for the -1500 and -1700 IHTs are provided in a table:
| Specification | -1500 | -1700 |
|---|---|---|
| Overall Transaxle Reduction | 24.6:1 | 24.6:1 |
| Input Speed (rpm) | 3000 max. 1800 min. | 3600 max. 1800 min. |
| Maximum Tire Diameter | 20 in. (508 mm) | 23 in. (584 mm) |
| Axle Shaft Diameter | 1.00 in. (25.4 mm) | 1.00 in. (25.4 mm) |
| Axle Shaft End Options | 4-Bolt Flange, Splined | 4-Bolt Flange, Splined |
| Brake Type | Disc | Disc |
| Weight of Unit | 53 lb. (24 kg) | 53 lb. (24 kg) |
The model and configuration of the -1500 or -1700 IHT can be determined from the label shown in Figure 6. The label includes:
The manual is structured to guide users through disassembly, inspection, and assembly procedures for various components, including the brake, bypass, control arm, fan and pulley, input shaft, auxiliary pump, charge pump, lower housing/filter/manifold, planetary differential, motor/center section/pump, and directional control assemblies. It emphasizes cleanliness, proper tool usage, and adherence to safety precautions.
General| Brand | Hydro-Gear |
|---|---|
| Model | 310-1500 |
| Category | DC Drives |
| Language | English |
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