Cub Cadet BDU-10/21- Manuals

BDU-10/21 BDU-10/21 Page 5 General Description BDU-21L/A Hydrostatic Flow Illustration BDU-10L/21L Hydrostatic Flow Illustration

BDU-10/21 BDU-10/21 Page 6 Maintenance BDU-21L/A BDU-10L Maintenance Check the transmission cooling fan for broken or distortedblades, and check to see that the fan is securely fastened.Replace the fan if damaged. Keep the transmission clean. Grass clippings and dirt willinfluence the cooling effici...

BDU-10/21 BDU-10/21 Page 7 Troubleshooting Diagram OPERATING HOT/LOSING POWER OPERATES IN ONE DIRECTION ONLY NOISY UNDER LOAD

BDU-10/21 BDU-10/21 WARNING!!! THE VEHICLE SHOULD BE ON LEVEL GROUND AND THE ENGINE DISABLED BEFORE PERFORMING ANY ADJUSTMENTS Page 8 Troubleshooting Chart SYMPTOM - OPERATES IN ONE DIRECTION ONLY POSSIBLE CAUSE CORRECTIVE ACTION -Inspect control linkage -Repair or replace -Inspect drive belt & ...

BDU-10/21 BDU-10/21 General Information Minor repairs may be performed, following the proceduresin this section, without voiding the unit warranty. Cleanliness is a primary means of assuring satisfactory lifeon either new or repaired units. Cleaning parts by usingsolvent wash and air drying is usual...

BDU-10/21 BDU-10/21 Shaft Seals Inspect the sealing area on the shaft for rust, wear, orcontamination. Polish the sealing area on the shaft ifnecessary. Wrap the spline or keyed end of the shaft with with a thinplastic or cellophane to prevent damage to the seal lipduring installation. Lubricate the...

BDU-10/21 BDU-10/21 Minor Repair Page 11 Bypass Valve Easy Ride Valve Inspect the check balls (or poppets) and mating seats inthe center section for damage or foreign material. Position the transmission so that the check valve port willbe in the upright position (as shown) and install the checkball ...

BDU-10/21 BDU-10/21 Charge Pump The correct charge pump orientation is determined by therotation of the pump shaft (CW or CCW). Before removingthe charge pump, make note of, and/or mark its position tosimplify the reassembly process. Page 12 Minor Repair BDU-21L Aux. CCW BDU-21L CCW BDU-21L CW BDU-1...

BDU-10/21 BDU-10/21 For BDU-21L: Install the charge relief valve spring and ball. Install the drive pin. Install the gerotor assembly. Install anew o-ring and the charge pump cover. NOTE: The charge relief spring must enter the recessed hole in the chargepump cover. Torque the bolts evenly to 12-15 ...

BDU-10/21 BDU-10/21 Page 14 Major Repair Charge PumpAssembly Procedures For BDU-21L with implement circuit: Install the drive pin. Install a new o-ring on each side of the gerotorassembly and position the gerotor assembly onto thealigning pins in the same orientation as it was removed.Install the ch...

BDU-10/21 BDU-10/21 Major Repair Page 15 BDU-10S Center Section Removal BDU-10S Aligning Pins and Gasket For BDU-10S remove the filter element, filter washer and spring from the housing. Remove the pump cylinder block kit from the pump shaft.Inspect the splines on the shaft and in the pump block for...

BDU-10/21 BDU-10/21 Major Repair Page 16 Disassembly Procedures Remove the motor thrust bearing assembly from thehousing. Remove the swashplate assembly and cradle bearings(BDU-10 only) from the housing. NOTE: The cradle bearings in newer BDU-21L transmis- sions are not removable from the housing. I...

BDU-10/21 BDU-10/21 Inspect the control shaft journal bearing for excessivewear. The BDU 10 control shaft journal bearing should be0.4722 to 0.4733 while the BDU 21 control shaft journalbearing should be 0.5904 to 0.5908. Inspect the BDU-10 motor shaft journal bearing for exces-sive wear. The BDU 10...

BDU-10/21 BDU-10/21 Install the swashplate into the housing. The slot on theswashplate must engage the slot guide block on thedisplacement control shaft. Use a tool such as a screw-driver or scribe to hold the guide block in position whileinstalling the swashplate. NOTE: As a product improvement, si...

BDU-10/21 BDU-10/21 Major Repair Page 19 BDU-21 Swashplate Components Measure Control Arm End Play BDU-10 Cylinder Block Kit BDU-21 with Swashplate Installed Install the thrust washer and pump cylinder block springonto the pump shaft. Install the springs piston washers and pistons into thecylinder b...

BDU-10/21 BDU-10/21 Install the motor thrust bearing into the housing. NOTE: It will be necessary to have a DRY journal bearing to prevent a hydraulic lock while installing the motor shaft. Install the motor shaft/cylinder block kit. Use caution toprevent damage to the journal bearing while guiding ...

BDU-10/21 BDU-10/21 Page 21 Major Repair BDU-10 For BDU-10 Check to see that the piston springs are centered in the cylinder block bores. If necessary, positionthem with a small screwdriver. Use caution to avoiddamage to the cylinder block face. For BDU-10S Install the filter spring, washer and new ...

BDU-10/21 BDU-10/21 BDU-10S Parts Drawing & Parts List Page 23 PARTS LIST . O N N O I T P I R C S E D . O N N O I T P I R C S E D 1 T F A H S P M U P 5 2 E T A L P H S A W S E L B A I R A V 2 G N I R G N I N I A T E R E R I W 0 3 L A E S P I L 3 G N I R A E B L L A B T F A H S 2 3 Y L B M E S S ...