Cub Cadet M48 manual

Service Manual IMPORT ANT : READ SAFETY RUL ES AND INSTRUCTIONS CAREFULL Y PRINTED IN USA FORM NO.769-00966 This Service Manual is not a substitute for th e Operator ’s Manu al. Y ou must read, underst and and follow all of the directions in this manual as well as the Oper ator ’ s Manual before working on this power equipment. (1 1/ 2003) CUB [...]

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TABLE OF CONTENTS M48 Tank .......................................................................................................... 1 About t his Section ............................................................................................. 1 Changes for ‘ 03 and ‘04 .....................................................................[...]

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M48 T ank 1 1. ABOUT THIS SECTION: The M48 is p art of the Cub Cadet Commercial T ank Series. The 2004 model year M48 is ver y similar to The 2001 model year T ank. Earlier versions of this machine have been covered in the “ 2001 Cub Cadet Commercial T echnical Handbook”: F orm #770- 10528. 2. CHANGES FOR ‘03 AND ‘04 • New hydro motor fra[...]

M48 Tank 2 3.5. For complete br ake adjustment procedures, refer to the “Brake Adjustment” section of this manual. For the purp ose of tracking, insu re that the brake linkage bellcra nks and rods are well lubricated, not dam aged, and work as intended. See Figure 3.5. 3.6. T o check for brake drag, open the the relief valve on each hydr o pump[...]

M48 T ank 3 3.12. If adju stment is necessary , re move the cutting deck. 3.13. Inspect the return to neutr al cylinders, rods, and bellcranks of the hydro control linkages. • The bellcranks should pivot easily without too much play . • The rods should not be bent, and the rod ends should not be loose. NOTE: The ro d end and jam nut at the rear[...]

M48 Tank 4 3.18. If one side does not dr ive as ef fectively as the other , test the o utput of the hydro pump to deter- mine if t he problem lies in t he pump or the hydro motor . By the process of elimination, if perfor- mance is lacking, br ake drag is eliminated, adjustment is correct, and the pu mp is O.K., then the problem is the motor . Pres[...]

M48 T ank 5 NOTE: The test can be performe d at either l ine between the pu mp and the motor . The top line on the motor is the in line from the pump when driving forwa rd. The linkage has mo re travel in forward tha n it does in re verse, so the test is most easily done on the top line of the pump, driving the pump in the forward d irection for- w[...]

M48 Tank 6 4.23. When the fluid is between 160-210 deg. f. (71-90 deg. c.) apply full forwa rd drive pressure to the lap bar with the engine runni ng at full speed (3600 RPM) while an assista nt closes the valve to the point where pressure reaches 300 PSI (21 Bar .). See Figure 4.23. NOTE: It may be necessary to over-shoot 300 PSI slightly , then o[...]

M48 T ank 7 5.6. Remove the nu t, washer , a nd cooling fan from the hydro pum p to be replaced, using a 9/16” wrench. See Figure 5.6. 5.7. Use a 3/8” breaker bar to move the belt ten- sioner pulley arm, slipping the belt of f of the pul- ley . See Figure 5.7. 5.8. Unhook the spring th at maintains ten sion on the arm. This will provide more fr[...]

M48 Tank 8 5.14. Open the relief valve on the hydro pu mp that is to be tested. This will relieve any residual hydraulic pr essure. See Figure 5 .14. 5.15. Confirm that the hydrau lic pressure has been relieved by rot ating the brake drum / hub assem - bly . If the it will not rotate, confirm that the brake is released and that the brake linkage is[...]

M48 T ank 9 5.24. Remove the handle from the relief valve using a 7/16” wrench and a 3/16” allen wren ch. 5.25. Remove the nut s fro m the carriage bolt s that hold the hydro pu mp to the hydro pump mount - ing plate. See Figure 5.25. 5.26. Carefully lower and remove the hydro pu mp. If it is to be returned to Cub Cadet, remove the yel- low plu[...]

M48 Tank 10 5.39. Install the wheels, lowe r the T ANK to the ground, and test run it in a safe area. Make any neces- sary adjustments before installing the cutting deck. 6. REPLACING THE HYDRO MOTOR 6.1. If the cutting deck is currently on the unit, remove it. 6.2. Safely lif t and support the rear of the t ank. 6.3. Remove th e rear wheels using [...]

M48 T ank 11 6.9. If the brake ass embly is to be transferred to the new hydro motor: remove the cotter pi n from the castle nut that holds the hub to the axle. 6.10. Loo sen, but do not rem ove the castle nut fr om the axle using a 1 1/2” socket. NOTE: It may be necessary to set the parking brake while loose ning the nut. Release the parking br [...]

M48 Tank 12 6.16. Withdraw the hydro mo tor , along with the three motor spacer s, and place them gently on a work bench. See Figure 6.16. 6.17. If th e brake is to be rem oved, remove the clip that holds the brake arm on the splined shaft, and mark t he location of the br ake arm on the splined shaft. 6.18. Remove the brake ar m from the splined s[...]

M48 T ank 13 6.28. Install the brake arm and clip on the new hydro motor . See Figure 6.28. 6.29. T ransfer the O ring to flare adaptor fittings from the old hydro motor to th e new hydro motor , using a 1” wrench. Inspect the fittings and O rings. If there is any do ubt about their condition, replace them. Lightly l ubr icate the O rings with oi[...]

M48 Tank 14 7.7. Loosen the jam nu t that locks the shoulder nut in position on the brake connec tor rod using a 9/16” wrench and a 3/4” wrench. See Figu re 7.7. 7.8. Remove the ha irpin clip that secures the brake link rod to the brak e arm on the brake assembly . 7.9. Repeat on othe r side. 7.10. Disconnect the brake link r ods (left an d rig[...]

M48 T ank 15 7.13. Confirm that the br ake bearing hub, brake han - dle, and the brake r od that connects them move freely on the front bellcrank shaf t. 7.14. Confirm the position of the brak e bearing hub: the top of the arm th at the brake rod (to the brake handle) conn ects to should line-up di rectly with the parking b rake s witch, and the br[...]

M48 Tank 16 7.21. Release the par king brake. 7.22. The brake bracket should draw up against the frame cross member . If th is reaction is not con- sistent, tighten the shoulde r nut slightly . There should be r oughly 1 1/2” betwe en the head of the shoulder nut and the brake bracket wh en the brakes are applied. 7.23. T ighten the jam nut. 7.24[...]

M48 T ank 17 8.3. The deck lif t goes ha s finer increment s of adjust- ment. See Figure 8.3. 8.4. The larger , heavier d ecks have a foot a ssist pedal to help raise and lower the deck. See Figure 8.4. Figure 8.3 Figure 8.4 8.5. Heavier hardwa re connects th e deck to the hangers. See Figure 8.5. 8.6. Heavier front p ivot bar and wider front track[...]

M48 Tank 18 8.7. The track at the rear has a lso increased. Extra brackets have been added to the frame to step the hydro moto rs out. See Figure 8.7. 8.8. T o enable the brake linkage to rea ch the reposi- tioned hydro motor , the rear brake arm assem- blies have been d oubled-up on each side. Instead of a single rear brake ar m assembly per side,[...]

M48 T ank 19 9. OTHER TANK FEATURES 9.1. Honda Power is of fered on t he M48-HN and M54-HN. The M48-HN has a 20 H.P . Honda V - twin engine. The M54-HN has a 24 H.P . Honda V -twin. See Figure 9.1. 9.2. ROPS is of fered on the M60- KW (Kawasaki) and M60-KH (Kohler). T his is not a bolt-on option. It is integrat ed into the frame. Th e option is pri[...]

M48 Tank 20 9.6. 1/4” incre ments on the height adjust er , wit h foot assist deck lift. See Figure 9.6. 9.7. The deck bel t release operates in a vertical plane. It can be tensioned with foot pre ssure, and the rear wheel does no t interfere with it s travel. See Figure 9.7. 9.8. Heavy duty spherical rod end s on the arms at the front of the dec[...]

M48 T ank 21 9.10. The deck itself features revers ible caster wheel brackets. The same p art number app lies to both the left and the r ight brackets. See Figure 9.10. 9.1 1. Improved self-aligni ng pillow blocks now sus- pend the deck. See Figure 9.1 1. Figure 9.10 Figure 9.1 1 9.12. The deck support plates are larger this year , to prevent plate[...]

M48 Tank 22 9.15. A guiding baf fle near the rear of the ope ning helps direct the clippin gs out from under the deck. See Figure 9.15. 9.16. The addition of a “Californi a Gap” at the leading edge also improves airflow , and products the internal shape of th e deck from damage if some - thing is hit hard enou gh to bend the reinforced leading [...]

M48 T ank 23 10. KOHLER EFI Fuel injection is nothing ne w . The Wright flyer that made history ab ove the dunes at Kitty hawk, North Carolina was fuel in jected. That was a h undred years ago this past su mmer . That system was only slightly more complex than a cam-d riven Windex bottle. All diesel engines are fue l injected, though the principles[...]

M48 Tank 24 10.5. The return lines each lead bac k to the t a nk from a tee fitting just beneath the tee fitting for the fuel feed lines. The return fuel comes from the fuel pressure regulator . NOTE: If one branch of the return line beco mes crushed, kinked, or blocked , a disproportionate amount of fuel will return the the opposite tank. • If o[...]

M48 T ank 25 10.8. There are two lines exiting th e pressure regula- tor . One is a regulated pressure line th at feeds the fuel rail via the fuel filter . The second line is a return line. The third line is a high pressure feed from the fuel pump. See Figure 10.8. NOTE: There are two potent ial failure modes for pressure regulators. They may reduc[...]

M48 Tank 26 10.1 1. The shrader valve can be used for checkin g fuel pressure. Fuel pressure readings obt ained at the shrader valve ca n help pin-down problems with the fuel pump or th e fuel pressure regulator . See Figure 10.1 1. 10.12. Before any service is performed on the pressur- ized portion of the fuel system, the en gine must be allowed t[...]

M48 T ank 27 1 1.4. The fuel pressure at the injectors is held con- stant by the fuel pressure r egulator . The amount of fuel delivered to the cylinders is controlled by the length of time that th e individual fuel injectors are triggered. The length of time the injectors are triggered varies from 1.5 to 8.0 milliseconds. 1 1.5. Both injectors are[...]

M48 Tank 28 • Do not connect a battery charger to the T ANK with the key switch turned on. • The ECU requires at least 7.0 volt s to function. • If the battery goes dead, or is disconnec ted, the adaptive memory in the ECU will be cleared. It will take 10-15 minutes of running, at normal operating tempera tures, under a variety o f loads and [...]

M48 T ank 29 • Crank triggers are ge nerally an all-or-nothing proposition: they work perfe ctly or not at all. In extremely r are instances, a failed crankshaf t trig- ger will not keep-up with the speed of the engine. It will work at low speed, but cause intermittent ignition and inje ctor action at higher speeds. This will result in st accato [...]