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Series 1000 and 1500 17.15 . Remove the belt from the tractor . • The tractor’s forward ground speed should vary smoothly between 0 and 5.2 MPH when the NOTE : There were a small number of tractors drive pedal is depressed progressively to the made using a CVT drive and a 2 - speed end of it’s travel . ( L - H - N - R ) GT transaxle . The belt must pass over • It is normal for the cruise control to hold a mow - the center mounted gear selector on these mod - ing speed that is about 10 % less than the 5.2 els for removal . Remove the knob from the gear MPH transport speed . selector , and remove the shift gait from the fender assembly to provide clearance . • If the tractor performs as described , no adjust - ment is required . 17.16 . Assembly notes : • Install the belts by reversing the order of the 18.2 . Diagnosis : If the tractor does not move at all , removal process . and the engine does not seem to be laboring as the pedal is depressed , the issue may be in the • The engine drive pulley is installed on the drive CVT belt system , the shift linkage leading to the shaft with the key side facing down . transaxle , or within the transaxle itself . • Line up the key on the PTO clutch during assem - 18.3 . To isolate the CVT belt system : bly . • Turn - off the engine . • There is a large flat washer that goes on top of the PTO clutch during assembly . • Release the parking brake . • Torque the PTO clutch bolt during assembly . • Place the gear selector in any motion gear . • When installing the belt guide , make sure that it • Attempt to push the tractor . passes through the cutout in the PTO clutch . this • If the tractor rolls , examine the shift linkage . acts as a anti - rotation bracket . See Figure 17.16 . • If the wheels lock when a gear is engaged , the transaxle and shift linkage are not likely to be the problem . 18.4 . If the tractor does not move at all , and the engine seems to be laboring as the pedal is Cutout depressed , the issue may be in the brake , or within the transaxle itself : • Turn - off the engine . • Release the parking brake . • Place the gear selector in Neutral . • Attempt to push the tractor . • If the tractor rolls with difficulty , examine the brakes as described in the “ BRAKE ADJUST - Figure 17.16 MENT : CVT � section of this manual . 18 . DRIVESYSTEM ADJUSTMENT : CVT 18.5 . If the problem can be isolated to CVT belt drive system , make a visual inspection of the CVT belt 18.1 . Make an operational test of the tractor : drive system : • The tractor should not “ creep � when the trans - • Turn the engine off , and allow it to cool before mission is in gear and the drive pedal is not starting to work on the tractor . depressed . • Remove the cutting deck . • On level ground , with the brake released , the gear selector should slip smoothly into gear . It is • Lift the seat . normal for gear engagement to be more difficult • Disconnect the battery cables , negative cable on a grade , or with the brakes applied because it first , using a 7 / 16 � wrench is more difficult for the drive dogs to engage under load or bind . • Remove the battery hold - down . 27
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Series 1000 and 1500 loads ( from torquing the nut ) directly to the pul - • Remove the battery and battery tray from the tractor . ley , not the adaptor . 18.6 . Inspect the upper drive belt : See Figure 18.6 . 18.8 . Repair any problems found . If the upper drive belt is correct and in serviceable condition , rein - stall it . If the upper drive belt needs to be replaced , the lower drive belt should be replaced as well . Refer to the “ TRACTION DRIVE BELT REPLACEMENT � section of this manual . 18.9 . Operate the drive pedal while observing the movement of the components controlled by the drive pedal . See Figure 18.9 . Observe movement Figure 18.6 • Is the upper drive belt correctly positioned on the tensioner pulley , transaxle input shaft pulley , and the upper sheave of the variable speed pulley ? • Inspect the type and condition of the belt . • Check the bearing on the tensioner pulley . Figure 18.9 • Check the tensioner pulley arm : it should return 18.10 . The double idler bracket should move with about readily to static position under spring tension . 10 lbs pressure applied to the pedal , and return • The center partition of the variable speed pulley under spring pressure as the pedal is released . should move up with light force and down under See Figure 18.10 . it’s own weight . 18.7 . The pulley on the transaxle input shaft should be firmly attached . • Early production tractors used a splined joint between the pulley and the input shaft . • Current production tractors carry the pulley on a separate hub that fits over the splined shaft . NOTE : The nut securing the pulley should be tightened to a torque of 10 - 15 ft . - lbs using an 11 / 16 � wrench . Over - torquing the nut may shear the input shaft . Replace the belleville washer between the nut and the pulley if it is flattened . NOTE : Some models used a special “ fully fin - ished � nut with an extended washer face . Do not replace this nut with a standard nut unless a Figure 18.10 washer is added between the nut and the pulley . The washer must have a big enough O . D . to fit over the star shape on the pulley adaptor , and must be sufficiently thick to transfer compression 28
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Series 1000 and 1500 18.11 . The empty hole in the double idler bracket 18.15 . The forward end of the speed control rod con - should swing through an arc of 1 3 / 8 � when 10 nects to a pin attached to the speed control lbs . of force is applied to the drive pedal . assembly . See Figure 18.11 . NOTE : On 2005 production units you can remove the nut on the ball joint and lift it out of the idler bracket on an angle , then skip to step 15.16 . See Figure 18.15 . 1 3 / 8 � movement 2005 production Figure 18.11 18.12 . If the measurement is not 1 3 / 8 � , check the type and condition of the lower drive belt . If the lower Figure 18.15 drive belt is worn or incorrect , replace both drive belts before adjusting the speed control . Refer to • Early production models may have a hairpin clip the “ TRACTION DRIVE BELT REPLACEMENT : and washer adjacent to the cam plate that pre - CVT � section of this manual . vents the speed control linkage from moving when the parking brake is applied . 18.13 . If the belts are serviceable and correct , adjust the length of the speed control rod to achieve the • Remove the hairpin clip and washer if so correct double idler bracket travel as described equipped . in the following steps : • Disconnect the pin from the speed control 18.14 . Loosen the jam nut that locks the speed control assembly using a pair of 9 / 16 � wrenches . rod into the rod - end joint at the double idler bracket with a pair of 9 / 16 � wrenches . 18.16 . Thread the rod in or out of the rod - end as required to achieve the correct linkage travel . See Figure 18.14 . 18.17 . When adjustment is complete : Jam nut • Secure the linkage and tighten any loosened fasteners . • Install the battery tray and battery . • Test the operation of the drive system in a safe area that is free of obstacles , hazards , and by - standers . • After successful testing , install the cutting deck , test all safety features , and return the mower to service . Figure 18.14 29