HY13-1521-M2/US Parker Product Effective: January, 2010 UHT Product Series Service Procedure
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information WARNING FAILURE OR IMPROPER SELECTION OR IMPROPER USE OF THE PRODUCTS AND/OR SYSTEMS DESCRIBED HEREIN OR RELATED ITEMS CAN CAUSE DEATH, PERSONAL INJURY AND PROPERTY DAMAGE. This document and other information from Parker Hannifin Corporation, its subsidiaries and authorized distributors provide product and/or system options for further investigation by users having technical expertise.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Section 1 General Information Definitions/Disclaimer Introduction/Design Features Troubleshooting Guide Troubleshooting Checklist Tools & Materials Required for Servicing Flow Test Instructions Exploded Views Section 2 4 5 6 7 8 9-10 11-20 Reseal & Repair Disassembly & Assembly - Fan Option Disassembly Assembly Section 3 21 22-29 30-38 Maintenance System Maintenance Tips Hydraulic Fluids Filtration Oil Temperat
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information WARNING A warning describes hazards or unsafe practices which could result in severe personal injury or death. A caution describes hazards or unsafe practices which could result in personal injury or CAUTION product or property damage. NOTE A note gives key information to make following a procedure easier or quicker.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Introduction The three-column format used in this Service Manual will help make it easy for you to service a UHT. Column 1 illustrates the procedure with photographs, Column 2 gives a brief key for each step, and Column 3 explains in detail the procedure you should follow. Pay special attention to the notes, cautions, and warnings. This manual contains troubleshooting information and checklists.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Troubleshooting Guide NOTE Before troubleshooting any system problem, check service literature published by the equipment and/or component manufacturers. Follow their instructions, if given, for checking any component other than the transmission. Hydraulic Components If you think the problem is caused by a hydraulic component, start by checking the easy-to-reach items.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Troubleshooting Checklist Trouble Oil Leakage Operates Hot No/Low Power Noisy Unit Cause 1. Fitting loose, worn or damaged. 2. Oil seals deteriorated by excess heat. 1. Debris buildup Remedy Check & replace damaged fittings or “O” rings. Torque to manufacturers specifications. Replace oil seals by disassembling unit. Remove debris 2. Cooling fan damaged Replace fan 3. Oil level low or contaminated 4.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Tools and Materials Required for Servicing • Clean, petroleum-based solvent • Emery paper • Vise with soft jaws • Air-pressure source • Arbor press • Flat screwdriver • Grease pencil or paint pen • Wheel puller • 1/4" torque wrench : 155-190 in-lbs, 282-342 in-lbs, 90-110 in-lbs, 160-200 in-lbs • Sockets: 3/8" drive ratchet, 5/16" hex, 1/4” hex, 3/8” hex, 10mm, 14mm, 16mm • Allen wrenches: 5mm, 6mm, 1/4" and 3/8” • Comb
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information UHT Flow Test Kit Instructions SK000251 Parts List Item Qty Part Number Description Torque 1 1 414002 SAE Swivel Fitting 525 in lbs. 2 1 411102 Needle Valve 525 in lbs. 3 2 414003 Gauge Fitting “T” 165-525 in lbs. 4 2 411103 3000 PSI Pressure Gauge 165 in lbs. 5 2 411104 Hose Assembly 525 in lbs. 6 2 414005 Reducer Fitting 525-950 in lbs. 7 1 411105 20 GPM Flow Meter 525 in lbs.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information CAUTION: All fittings and hoses must be securely attached. The test is accomplished using the vehicle’s high pressure system lines. Failure to secure connections could result in bodily injury. 5. Completely open the restriction valve. 6. Start the engine and, if required, engage the drive pulley. 7. Slowly bring engine up to maximum operating speed. 8.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information EXAMPLE: First Reading 300 psi (21 bar) 5 gpm (19 l/min) Second Reading 1000 psi (69 bar) - 3 gpm (11 l/min) Difference 2 gpm (8 l/min) By subtracting the second reading from the first, a defective pump can be identified. In the example above, 2 gpm indicates a defective pump.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information 12 Parker Hannifin Corporation Hydraulic Pump/Motor Division Greeneville, Tennessee USA
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information 13 Parker Hannifin Corporation Hydraulic Pump/Motor Division Greeneville, Tennessee USA
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Note: When servicing UHT assemblies with a serial number code of 09256 or earlier, item 29 is not required. When servicing UHT assemblies with a serial number code of 09257 or after, item 25 is not required. Though item 22 is provided in the seal kit, it can be discarded if the endblock does not include a machined seal groove.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information ITEM 22 23 24 QTY 4 4 1 ITEM 27 28 31 QTY 1 1 1 ITEM 22 23 24 25 26 27 28 29 30 31 QTY 1 4 4 1 2 1 1 6 1 1 ITEM 8 9 10 11 QTY 1 1 1 1 ITEM 5 6 7 12 13 14 15 16 17 18 22 23 24 QTY 1 1 1 1 2 1 1 ITEM 19 20 21 QTY 1 1 1 ITEM 1 2 3 4 QTY 1 1 1 1 1 1 1 4 4 SK000243 - PART LIST PART NUMBER DESCRIPTION 032202-017 PACKING, PREFORMED, O-RING SEAL 032860-001 RETAINER, PACKING BACKUP 032203-114 PACKING, PREFORMED, O
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information ITEM 32 33 25 QTY 1 2 1 1 ITEM 32 33 25 QTY 1 2 1 1 ITEM 32 33 25 QTY 1 2 1 1 ITEM 32 33 25 QTY 1 2 1 1 ITEM 32 33 QTY 1 2 1 ITEM 32 33 QTY 1 2 1 ITEM 32 33 QTY 1 2 1 ITEM 32 33 QTY 1 2 1 ITEM 32 33 QTY 1 2 1 ITEM 32 33 QTY 1 2 1 SK000257 - PART LIST PART NUMBER DESCRIPTION TL0240ZF080UHTA SA, MOTOR 036016-008 PLUG, HOLLOW HEX 032203-249 PACKING, PREFORMED, O-RING SEAL SK000243 SERVICE KIT, SEALS SK0
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information ITEM 34 QTY 1 1 ITEM 34 25 QTY 1 1 1 ITEM 35 12 QTY 1 1 ITEM 35 12 QTY 1 1 ITEM 36 QTY 1 SK000267- PART LIST PART NUMBER DESCRIPTION HB011002 NOSE CUP, MACHINED SK000243 SERVICE KIT, SEALS SK000268 - PART LIST PART NUMBER DESCRIPTION HB011003 NOSE CUP, MACHINED 032203-249 PACKING, PREFORMED, O-RING SEAL SK000243 SERVICE KIT, SEALS SK000271- PART LIST PART NUMBER DESCRIPTION HB012002-A1 SA, TOP HOUSING 034001 G
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Before you disassemble the UHT or any of its components, read this entire manual. It provides important information on parts and procedures you will need to know to service the UHT Unit. The UHT will have a six cross member bolts and four frame mounting bolts. Remove fan from shaft prior to servicing any portion of UHT unit to prevent from breaking.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Clean unit of grass and other debris; let dry. Remove unit from vehicle Drain the oil from the unit Remove the fan and fan spacer Inspect drive fingers for wear Note: Some units may not have a fan. If fan is not present, skip to next step. Remove the pulley Inspect the pulley for damage or abnormal wear Remove the motor bolts Remove the breather/dipstick assembly. Place an oil pan under the unit for oil collection.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Remove the complete drive motor Remove the nosecup Remove the transfer tubes Remove the charge pump cover seal snap ring Remove the motor from the nosecup by tapping cast iron housing with a soft-face mallet and gently prying on the flange surface of the motor taking care not to damage the aluminum nosecup.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Disassemble the pump section Note: Two left bolts measure 1 ¾” long the other four are 2 ¾” long. Disassemble the pump section Using a 9/16” socket remove the (6) 3/8-16UNC bolts securing the top housing to the endblock. Note two (2) of the bolts are shorter than the other four (4) that secures the charge pump cover to endblock and top housing.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Remove bearing cage and thrust washers Note: Washers should be re-installed in the same orientation/position they were found – Do not Flip Remove the trunnion arm and control block Caution: Do not remove the two cradle bushings! Trunnion arm seal Remove the bearing cage and thrust washers from the swash block by lifting them out. Check both washers and bearing for excess wear or pitting damage.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Remove the cylinder block Remove spring retainer Remove the cylinder block assembly Inspect pistons, bores and both running surfaces Check for excessive wear Remove the snap ring from the pump shaft with external snap ring pliers. Use care not to over-stretch snap ring. Take special notice not to scratch sealing zone on shaft while removing and replacing snap ring.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Remove the charge pump cover and shaft bearing sub-assembly from end block Remove the charge pump cover assembly and shaft bearing sub-assembly by sliding the pump shaft through the central hole in the end block. Push out charge pump seal with shaft. Remove charge pump seal Remove shaft bearing subassembly from charge pump cover Pull shaft bearing subassembly from charge pump cover.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Remove charge pump rotor and stator Remove two dowel pins Remove the charge pump pressure relief valve Orifice Plug Remove charge pump rotor, stator and o-ring. Inspect for scoring or any damage to rotor and stator. Inspect the O-ring, it should be flexible and conform to the o-ring groove in the charge pump cover. Remove the dowel pins by sliding the pins out of the bores in the end block.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Remove the bypass valve snap ring Remove the bypass valve Remove the shock / check valves Shock Valves Remove the snap ring securing the bypass valve in the bore with internal snap ring pliers. Remove the bypass valve from the bore by pulling the valve directly out of the bore in the end block. Remove shock valve with 3/8” allen head socket 16cc – 280 will have 241 number on the outside of shock valve.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Check Valves Remove check valve with 5/16” allen head socket . Check valves will not have any numbers on the outside. Please refer to picture to determine if you have either check or shock valves.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information End block assembly Orifice plug is clean Install the shock / check valves 16cc – 280 will have 241 number on the outside of shock valve 12cc – 240 will have 275 number on the outside of shock valve Key factor in the successful repair is cleanliness. Prior to assembly make sure all exposed surfaces are thoroughly clean and free of foreign material and chemicals.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Install bypass valves Install the bypass valve retaining ring, pliers required Install the bypass valve. Push valve directly in the bore of the end block as far as it will go. Install the snap ring securing the bypass valve in the bore. Place retaining ring on bypass valve shaft and position into the groove on the inside of the bypass valve port.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Install ¼ SAE hex plug into port on side of end block Torque to specifications Install charge relief cartridge Install the ¼ SAE hex plug. Hand start several threads to prevent cross threading. Torque ¼ SAE hex plug on side of end block 252 – 288 in lbs. Install the charge relief cartridge hand start several threads to prevent cross threading. Using a ¼ “ allen head socket torque to 252 – 288 in lbs.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Polish I.D. with emery cloth paper Remove any burrs with emery cloth paper from the I.D. of trunnion seal area. Clean area with a lint free cloth after polishing I.D. Replacement Trunnion seal With the flat side of seal facing up push seal in flush to top housing. Place socket on top of seal Place 11/16 deep well socket over seal. Tap seal into place Gently tap socket with rubber hammer driving seal into place.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Install retainer clip Place retainer clip with the tongs pointed away from seal. Seat retainer clip Gently tap socket with rubber hammer driving retainer clip. Visual check Loctite ™ 242 Threadlocker See that the seal retainer is flush with the top of the housing. Apply Loctite ™ 242 Threadlocker to the O.D. of seal bore Use of Loctite ™ 242 eliminates the need for a snap ring.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Apply Loctite ™ 242 Threadlocker to the O.D. of the fan seal Note: Loctite ™ 242 should not contact rubber I.D. on seal. Press fan seal into top housing bore Look for rubber scraped off by snap ring groove replace seal if it has been damaged Place a rubber hammer on top of seal. Use second rubber hammer drive seal into cavity flush.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Apply Oil Install swash block Apply OEM recommended oil to cradle bushings. Install swash block subassembly onto cradle bearing in top housing. Verify that swash block moves freely back and forth on bushing without binding or dragging Apply Oil into swash block Apply OEM recommended oil prior to installing thin washer into swash block Install thrust washer Install thin (.143”) thrust washer into swash block.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Install top washer Install thick (.261”) thrust washer into swash block. Apply Oil to top washer Apply OEM recommended oil to top of thrust washer. Install charge pump shaft and bearing assembly into charge pump cover. After bearing installation ensure there is room for the seal. Place charge pump cover face down with the extended shaft through hole in table.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Install charge pump seal Place seal over output shaft requires pushing down on seal below snap ring groove of cover. Ade of a socket that fits flush to the face of seal lightly tap until seal is below snap ring groove. Install snap ring Use internal snap ring pliers and insert snap ring into groove of charge pump cover.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Install charge pump shaft into end block With the end block sitting on edge insert the charge pump shaft until face of charge pump cover mates to end block. Temporarily bolt charge Use two charge pump cover bolts, flat washers and nuts, pump cover to end finger tighten to temporarily block hold the charge pump cover to end block.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Central spring and bushing Place central spring and bushing onto pump shaft on top of barrel. Install snap ring onto shaft Using internal snap ring pliers, put retaining snap ring over pump shaft and place on top of the central spring bushing. Place 16mm socket over shaft Place a 16mm deep well socket 3 ½” long over shaft resting on the snap ring.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Remove two nuts and washers Remove the two nuts and washers. Install face gasket Install gasket onto sealing surface of top of end block. Install all six bolts Install the two hex bolts that are (1.75”) long in the end block install the other four hex head bolts that are (2.75”) long through charge pump cover and through end block.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Carefully assembly top housing to end block Slip pump shaft through the center hole of swash block Hand tighten bolts While holding the top housing level to end block hand start each of the six bolts with socket to secure both the top housing and end block together. Torque all six hex head bolts Going diagonal from each bolt torque to 300 – 336 in lbs.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Install both pipe tubes Inspect interface for slivers of backup ring replace if sheared Oil all O-rings on both ends of pipe tubes. First slightly rotate pipe into end block tube holes. With the palm of your hand slightly compress tubes down pass O-rings. Install O-Ring if hole is present Oil O-ring and place into position. Install nose cup Position nose cup over both tube pipes.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Oil nose cup ID Note: If assembly does not have motor o-ring skip this process. Install wheel motor into nose cup Install pump pulley Use OEM recommended oil to lube the ID of the nose cup where the motor O-ring will be located. Position the motor tube holes of the wheel motor casting over the two oil pipes.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Torque nut Install brake cable bracket nearest to “A” port as shown. Position brake cable While holding the pulley in place with a adjustable spanner wrench tighten the nut to 55-70 ft lbs. Orient the slot opening towards “A” & “B” ports. Insert long hex head bolt through brake cable bracket motor flange hole and nose cup install the other three large hex head bolts.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Install fan Note: If assembly does not have Fan. Install shaft cover by applying Loctite ™ 242 to bottom edge and tap (gently) into top housing bore until seated. Place fan on top of pump washer with the blades face down as shown in picture. Place fan washer with the tangs in-between fan tabs Install fan washer Install bolt to secure fan By pass lever Install snap ring Apply Loctite ™ 242 to the threads of bolt.
Service Manual Series HB Hydrostatic Transmission HY13-1521-M2/US General Information Secure snap ring in groove Make sure snap ring is secure in groove keep the by pass lever position towards output shaft of drive motor Assembly complete Start up and purge vehicle With the rear tires jacked up off the ground cycle transmissions full speed for 30 seconds each direction. Recheck reservoir dipstick to make sure reservoir level is full.
System Maintenance Tips Adjust fluid level in reservoir as necessary. Encourage all operators to report any malfunction or accident that may have damaged the hydraulic system or component. Do not attempt to weld any broken component. Replace the component with original OEM equipment only. Do not cold straighten, hot straighten, or bend any part. Prevent dirt or other foreign matter from entering the hydraulic system. Clean the area around the oil dipstick cap before checking oil level.
