HGM-H™ Series Motor Service and Repair Manual
33Pages

HGM-H™ Series Motor Service and Repair Manual BLN-0043 January 2018

TABLE OF CONTENTS Foreword. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Assembly After a Complete Teardown. . . . . . . . 23 Drive Motor Exploded View. . . . . . . . . . . . . . . . . 24 Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . 5 Product Identification . . . . . . . . . . . . . . . . . . . . . . . . . 5 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Personal Safety. . . . . . . . . . . . . . . . . . . . . . . . . . 6 Tool Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Work Area Safety . ....

FOREWORD Headquartered in Sullivan, Illinois, Hydro-Gear is a world leader in the design, manufacture, and service of quality hydrostatic transaxles for the lawn and garden industry. The mission of our company is to be recognized by our customers and the industry as a world-class supplier and the quality leader in everything we do. Internal repair procedures require that the HGM-H series motor be removed from the vehicle. This Service and Repair Manual is designed to provide information useful in servicing and troubleshooting the Hydro-Gear® HGM-H™ series motor. This is not a certification,...

DESCRIPTION AND OPERATION INTRODUCTION The purpose of this manual is to provide information useful in servicing the Hydro-Gear® HGM-H series motor. This manual includes the HGM-H series motor general description, hydraulic schematic, technical specifications, servicing and troubleshooting procedures. Should servicing be required, the exterior of the motor will need to be thoroughly cleaned before beginning most procedures. Do not wash the transaxle while it is hot. Do not use a pressure washer to clean the unit. GENERAL DESCRIPTION The HGM-H series hydraulic motors are fixed displacement...

EXTERNAL FEATURES HGM-H SERIES MOTORS “B” PORT “A” PORT HYDRAULIC HOUSING CAP HUB NUT COVER FILL PORT / OPTIONAL CASE DRAIN — Back View— “A” & “B” PORTS FILL PORT / OPTIONAL CASE DRAIN

TECHNICAL SPECIFICATIONS HGM-H ™ P iston M otor TECHNICAL SPECIFICATIONS Geometric Displacement Maximum Speed Maximum Torque Maximum Oil Flow Continuous Axle Shaft Diameter Axle Shaft End Options Parking Brake Type Max. weight applied to shaft/housing Wheel Load Force - Radial PRODUCT IDENTIFICATION The model and configuration of the HGM-H can be determined from the label found on the transaxle. Date (Julian- Day of year) Serial Number (unique for that model - for that day) Type of Product and Build Information Figure 2, Product Label

SAFETY This symbol points out important safety instructions which, if not followed, could endanger the personal safety and/or property of yourself and others. Read and follow all instructions in this manual before attempting maintenance on your hydraulic motor. When you see this symbol - HEED ITS WARNING. Wear appropriate clothing. Loose or hanging clothing or jewelry can be hazardous. Use the appropriate safety equipment, such as eye and hearing protection, and safety-toe and slip-proof shoes. Never use compressed air to clean debris from yourself or your clothing. TOOL SAFETY Use the...

TROUBLESHOOTING WARNING Do not attempt any servicing or adjustments with the engine running. Use extreme caution while inspecting the drive belt assembly and all vehicle linkage! Follow all safety procedures outlined in the vehicle owner’s manual. In many cases, problems with a hydraulic systems are not related to a defective hydraulic unit, but are caused by slipping drive belts, partially engaged bypass valves, and loose or damaged control linkages. Be sure to perform all operational checks and adjustments outlined in Service and Maintenance, before assuming the hydraulic system is...

SERVICE AND MAINTENANCE EXTERNAL MAINTENANCE Regular external maintenance of the hydraulic motor should include the following: 1. Check the vehicle operator’s manual for the recommended load ratings. Insure that the current application does not exceed load rating. 2. Check reservoir oil level in accordance with the vehicle manufacturers recommendations. 3. Inspect the vehicle drive belt, idler pulley(s), and idler spring(s). Insure that no belt slippage can occur. Slippage can cause low input speed to the pump resulting in low flow to the hydraulic motor. 4. Inspect the vehicle control...

SERVICE AND MAINTENANCE PURGING PROCEDURE The HGM-H motor can not be purged of air as a stand alone component. The hydraulic system as a whole will need to be purged after any addition of oil to the system or a complete oil change. This will most likely involve the use of the hydraulic pumps bypass feature. If this is not available, see the manufacturers recommendation for air purging. Due to the effects air has on efficiency in hydrostatic drive applications, it is critical that air is removed or purged from the system. These purge procedures must be preformed anytime a hydrostatic system...

TEAR DOWN AND REASSEMBLY HOW TO USE THIS MANUAL Each subassembly illustrated in this manual is illustrated with an exploded view showing the parts involved. The item reference numbers in each illustration are for assembly instructions only. See page 25 for part names and descriptions. A complete exploded view and item list of the transaxle is provided at the end of the repair section. GENERAL INSTRUCTIONS Cleanliness is a primary means of assuring satisfactory life on repaired units. Thoroughly clean all exposed surfaces prior to any type of maintenance. Cleaning of all parts by using a...

TOOLS Miscellaneous Three Jaw Puller Flat Blade Screw Driver (2) Torque Wrench Air Impact Wrench Rubber or Neoprene Mallet Breaker Bar Side Cutters/Snips Needle Nose Pliers Large External Snap Ring Pliers Small Internal Snap Ring Pliers 1/2”-3/8” Adapter 3/8” Deep 1-1/8” Deep 1/4” Allen 3/4” Deep Screw, Housing Nut, Axle, Castlelated Nut, Brake Plug 9/16-16 (Metal) 280-340 in-lbs (31.6-38.4 Nm) 275-350 ft-lbs (372.9-474.5 Nm) 600-800 in-lbs (67.8-90.4 Nm) 110-170 in-lbs (12.4-19.2 Nm) All Housing Screws Hub Brake Shaft Oil Input Port