Page 3 - TablE of ConTEnTS; Section
TablE of ConTEnTS Section Page foreword .............................................................................................................................. 1Description and operation ................................................................................................. 2 Introd...
Page 4 - forEword; This is not a certification, test or study guide for
EZT ® 1 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 custom- ers and the industry as a world-class supplie...
Page 5 - warning; actuating the bypass will result in the; inTroducTion; do not use a pressure washer to; gEnEral dEscripTion; sEcTion 1. dEscripTion and opEraTion
2 EZT ® of the swashplate reverses the flow of oil from the pump and thus reverses the direction of the motor output rotation. The pump and motor are of the axial piston design and utilize spherical nosed pistons which are held against a thrust race by internal compression springs. The EZT has a sel...
Page 6 - HYdraulic scHEMaTic
EZT ® 3 HYdraulic scHEMaTic Figure 2 provides an illustration of the hydraulic oil circuit. The oil supply for the hydraulic sys- tem of the EZT ® is also utilized for lubricating the components of the final drive assembly. The input shaft and pump cylinder block are turned in one direction only by ...
Page 7 - EXTErnal fEaTurEs EZT
4 EZT ® EXTErnal fEaTurEs EZT ® AXLE SHAFT BYPASS ARM MAIN HOUSING FILL PORT INPUT SHAFT CONTROL ARM COG BRAKE DISC BRAKE ARM SIDE COVER FAN PULLEY AXLE SHAFT
Page 8 - TEcHnical spEcificaTions; Technical specifications for the EZT; input speeds; producT idEnTificaTion
EZT ® 5 TEcHnical spEcificaTions Technical specifications for the EZT ® are listed in Table 1. Table 1. Technical Specifications input speeds weight of unit Maximum: 3000 RPM 29 lbs. (13 Kg) Minimum: 1800 RPM Table 2. EZT component options Figure 3. Configuration Label producT idEnTificaTion The mod...
Page 9 - pErsonal safETY; The floor should be clean and dry, and all ex; sErvicing safETY; Some cleaning solvents are flammable. Use
6 EZT ® This symbol points out important safety instructions which, if not followed, could endan- ger the personal safety and/or property of your- self and others. Read and follow all instruc- tions in this manual before attempting main- tenance on your transaxle. When you see this symbol - HEEd iTs...
Page 10 - sEcTion 3. TrouBlEsHooTing
EZT ® 7 Vehicle tires improperly inflated Refer to vehicle manufacturer suggested pressure Control linkage bent or out of adjustment Repair or replace linkage, Pages 8 and 11 Bypass assembly sticking Repair or replace bypass, Page 21 warning do not attempt any servicing or ad- justments with the eng...
Page 11 - fluids; The fluids used in Hydro-Gear products have; fluid voluME and lEvEl; Certain situations may require additional fluid; sEcTion 4. sErvicE and MainTEnancE; EXTErnal MainTEnancE
8 EZT ® fluids The fluids used in Hydro-Gear products have been carefully selected, and only equivalent, or better products should be substituted. Typically, an engine oil with a minimum rating of 9.0 cSt (55 SUS) at 230° F (110° C) and an API classification of SL is recommended. A 20W50 engine oil ...
Page 12 - fluid cHangE procEdurE; This transaxle is factory filled, sealed and does; noTE: if removing the wheel from the; Fill the transaxle at the oil fill port according; fluid description; fluid cHangE
EZT ® 9 fluid cHangE procEdurE This transaxle is factory filled, sealed and does not require oil maintenance. However, in the event of oil contamination or degradation, oil addition or change may alleviate certain per- formance problems.1. Remove the transaxle from the vehicle. noTE: if removing the...
Page 13 - purging procEdurEs; Due to the effects air has on efficiency in hy
10 EZT ® purging procEdurEs Due to the effects air has on efficiency in hy - drostatic drive applications, it is critical that it is purged from the system.These purge procedures should be imple- mented any time a hydrostatic system has been opened to facilitate maintenance or any additional oil has...
Page 14 - rETurn To nEuTral sETTing; Confirm the transaxle is in the operating
EZT ® 11 warning poTEnTial for sErious injurY inattention to proper safety, operation, or maintenance procedures could result in personal injury, or damage to the equipment. Before servicing or repair- ing the EZT ® , fully read and understand the safety precautions described in this section. warnin...
Page 15 - How To usE THis Manual; item reference numbers; gEnEral insTrucTions; from the appropriate kits identified in the Items; TransaXlE rEMoval; liMiTEd disassEMBlY; the “Assembly” portions of the procedures. If
12 EZT ® sEcTion 5. rEpair How To usE THis Manual Each subassembly illustrated in this section is illustrated with an exploded view showing the parts involved. The item reference numbers in each illustration are for assembly instruc- tions only. See page 31 for part names and descriptions. A complet...
Page 16 - Tools and TorQuEs
EZT ® 13 Table 5. required Tools Miscellaneous EZT ® Service & Repair Manual Flat Blade Screw Driver (2) Torque Wrench Air Impact Wrench Rubber Mallet Breaker Bar Side Cutters/Snips pliers Needle Nose Large External Snap Ring Small Internal Snap Ring Tools and TorQuEs sockets 1/2”-3/8” Adapter 3...
Page 17 - disassembly; This procedure is only necessary if; Place the axle so that the pin lock is at the; inspection; Inspect the hub and axle splines for any; assembly; anytime a hub and/or hub nut is; to specifications in Table 6 on page 13.
14 EZT ® wHEEl HuB and nuT (codE - a, c, f, or H) EXAMPLE: Z HRefer to Figure 6. disassembly noTE: This procedure is only necessary if your unit is equipped with a pin locking nut (figure 6a). other units under this code are not equipped with a pin lock- ing nut. 1. Place the axle so that the pin lo...
Page 18 - Reference page 18 and 19 for side housing; Slide axle shaft assembly into axle horn of
EZT ® 15 wHEEl HuB and nuT (codE - p, r, T, or u) EXAMPLE: Z PRefer to Figure 7. disassembly noTE: The following procedure is used for teardown of the EZT unit when as- sembled with a taper lock shaft. The hub and hub nut should not be removed unless they have been damaged. 1. Reference page 18 and ...
Page 19 - If necessary, remove and replace the control; rod. Secure the bypass arm with a new re-; conTrol arM and BYpass arM
16 EZT ® figure 8. control arm and Bypass arm Refer to Figure 8. disassembly 1. Loosen and remove the lock nut (26) and flat washer (24). Discard the lock nut (26) and flat washer (24). 2. Remove the torx head screw (25) from the directional control. 3. Remove control arm (23) and pucks (22). Discar...
Page 20 - input seal; housing bore with a “hook” type tool. Care; output seal; sEal KiT rEplacEMEnT
EZT ® 17 figure 9. seal Kit replacement Before disassembly, wipe the unit free of any debris to avoid contamination.Refer to Figure 9. input seal 1. Remove the input pulley from the input shaft. 2. Remove the seal retaining ring (34).3. Carefully pull the input seal (33) out of the housing bore with...
Page 21 - cog BraKE assEMBlY
18 EZT ® Refer to Figure 10. disassembly 1. Remove the control arm and bypass arm. See page 16. 2. Remove the oil from the transaxle. See page 9. 3. Remove the brake arm spring (75), if in- stalled. Remove the brake arm screw(s) (73), washer(s) (72), brake arm (74) and bushing(s) (71). 4. Remove the...
Page 22 - disc BraKE assEMBlY
EZT ® 19 disc BraKE assEMBlY 160 159 158 74 75 157 156 2X 155 73 154 153 151 2X 150 100 153 10 figure 11. disc Brake assembly Refer to Figure 11. disassembly 1. Remove the control arm and bypass arm. See page 16. 2. Remove the oil from the transaxle. See page 9. 3. Remove the brake arm bias spring (...
Page 23 - sidE covEr; specification in Table 6 on page 13.
20 EZT ® 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Refer to figure 12. disassembly 1. Remove the control arm and bypass arm. See page 16. 2. Remove the oil from the transaxle. See page 9. 3. Remove the brake assembly. See pages 18 and 19. 4. Remove the motor shaft lip seal. See page 17. 5. Remove the s...
Page 24 - aXlE sHafT, rEducTion gEars and EXpansion plaTE
EZT ® 21 Refer to Figure 13. disassembly 1. Remove the bypass arm and control arm. See page 16. 2. Remove oil from the transaxle. See page 9. 3. Remove the side cover. See page 20.4. Remove the spiral retaining ring (45), bull gear (46), inboard sleeve bearing (48) and washer (47). 5. Remove the red...
Page 25 - Remove the control arm and bypass arm.; MoTor sHafT
22 EZT ® figure 14. Motor shaft Refer to Figure 14. disassembly 1. Remove the control arm and bypass arm. See page 16. 2. Drain the oil from the transaxle. See page 9. 3. Remove the side cover. See page 20.4. Remove the reduction gears. See page 21. 5. Remove flat washer (36), motor shaft and pinion...
Page 26 - is correct, the shaft assembly will fit into; inpuT sHafT and BYpass rod
EZT ® 23 figure 15. input shaft and Bypass rod assembly Refer to Figure 15. disassembly 1. Remove the control arm and bypass arm. See page 16. 2. Drain the oil from the transaxle. See page 9. 3. Remove the side cover. See page 20.4. Remove the reduction gears. See page 21. 5. Remove the motor shaft....
Page 27 - block assembly, keep the block face flush; HYdraulic coMponEnTs
24 EZT ® Refer to Figures 16-25. disassembly 1. Remove the bypass arm and control arm. See page 16. 2. Drain the oil from the transaxle. See page 9. 3. Remove the side cover. See page 20.4. Remove the reduction gears. See page 21. 5. Remove the motor shaft. See page 22.6. Remove the input shaft and ...
Page 29 - . Care must be taken to prevent the scaring
26 EZT ® (swashplate/pump Block) 11. (see figure 19) Install the pump thrust bearing (35) in the trunnion machined swashplate (19). NOTE: Place the thin race of the bearing towards the swashplate. The thick race must face the pistons. 12. (see figure 17) Place the pump block assembly (4), pistons do...
Page 31 - TransaXlE insTallaTion
28 EZT ® figure 24. Use the following procedure to complete the installation of the transaxle on the vehicle.1. Install and secure the transaxle on the vehicle according to the instructions in the vehicle owner’s manual. 2. With the vehicle raised, install the wheels on the axles, and snug the wheel...
Page 32 - following summary identifies the assembly pro; assEMBlY afTEr a coMplETE TEardown
EZT ® 29 If the unit has been torn down completely, the following summary identifies the assembly pro - cedures necessary to completely assemble the unit. Each assembly procedure is located by a page reference.The part reference numbers provided in each assembly procedure are keyed to the individual...
Page 33 - Prior to applying the new sealant, the; sEalanT applicaTion
30 EZT ® noTE: Prior to applying the new sealant, the old sealant must be removed from all sur- faces.A small consistent bead of the sealant around the housing face will be sufficient. Use spar- ingly.The illustration below indicates the correct areas. sEalanT applicaTion
Page 34 - noTEs
Page 37 - A line returning fluid from the component housing to the reser; glossarY of TErMs
34 EZT ® Axial Piston: Type of design for hydraulic motors and pumps in which the pistons are arranged parallel with the spindle (input or output shaft). Bantam Duty: A descriptive term relating to the product capacity (meaning: light duty). Bypass Valve: A valve whose primary function is to open a ...
Page 38 - Hydrostatic Transmission:
EZT ® 35 Hydrostatic Transmission: The combination of a hydraulic pump and motor in one housing to form a device for the control and transfer of power. Inlet Line: A supply line to the pump. Integrated Zero-Turn Transaxle: The combination of a hydrostatic transmission and gear case in one housing to...
