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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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  #11  
Old 4 Weeks Ago
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giderich giderich is offline
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AFAIK there is no adjustment on the "kick-down" switch, perhaps you are thinking of the adjustment on the ZF load-sensor. I usually was successful on down-shifting my former 89 FC by toggling the ZF mode switch from economy to power setting. Make sure your are achieving full RPMs and the load sensor is properly adjusted.
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  #12  
Old 4 Weeks Ago
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Quote:
Originally Posted by giderich View Post
AFAIK there is no adjustment on the "kick-down" switch, perhaps you are thinking of the adjustment on the ZF load-sensor. I usually was successful on down-shifting my former 89 FC by toggling the ZF mode switch from economy to power setting. Make sure your are achieving full RPMs and the load sensor is properly adjusted.
Dick's (two coaches ago) memory is correct. A ZF tech sets the rheostat with a voltage test box. But attempts can be made mechanically to set up the TPS.
Reading this forum seems some ZFs have the kick down button switch and some may not or the posts may have unverified info.
Our ZF's are set up with overdrive in "D". There are two gears in button "1" , then "2" then "3". The power switch holds the gears longer.
ZF is difficult to down shift. Try Dick's suggestion. once downshifted, hold the gear with the shift Buttons, Once realeased with the higher shift button or moving from power to econ, it is again difficult to downshift.
Be sure to lock those downshifts climbing before the crest of the mountain.
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Last edited by Bill Pape; 4 Weeks Ago at 01:49 PM. Reason: TPS
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  #13  
Old 4 Weeks Ago
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So the ZF has a throttle sensor on the engine, or it’s a cable from the engine to the transmission? Any adjustment in that mechanically that would adjust the shift points?
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1984 Bluebird PT40
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  #14  
Old 4 Weeks Ago
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Quote:
Originally Posted by 1984Lodge View Post
So the ZF has a throttle sensor on the engine, or it’s a cable from the engine to the transmission? Any adjustment in that mechanically that would adjust the shift points?
It is a little confusing, the TPS is a cable driven Rheostat that is mechanically adjusted. the cable is attached to the injection pump. It helps monitor the throttle. The ECM will not allow the tranny to go into gear above about 800RPM.
The adjustment seems to help shift smoother.
The only way to change the shift points is the use of a switch labeled Econ/Power, or there is a plug in Integrated chip that BB/ZF had that can change the shift points. Our BB ZF's are programmed for highway speeds. The 3208 , 300HPTAT is capable of 3000 rpm, with the overdrive it can hit 80mph.
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  #15  
Old 4 Weeks Ago
mattafact mattafact is offline
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Quote:
Originally Posted by Bill Pape View Post
It is a little confusing, the TPS is a cable driven Rheostat that is mechanically adjusted. the cable is attached to the injection pump. It helps monitor the throttle. The ECM will not allow the tranny to go into gear above about 800RPM.
The adjustment seems to help shift smoother.
The only way to change the shift points is the use of a switch labeled Econ/Power, or there is a plug in Integrated chip that BB/ZF had that can change the shift points. Our BB ZF's are programmed for highway speeds. The 3208 , 300HPTAT is capable of 3000 rpm, with the overdrive it can hit 80mph.
My bus came with a very old looking computer chip. Could this be that chip you are speaking of? What does it change the shift points to?
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  #16  
Old 4 Weeks Ago
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Quote:
Originally Posted by mattafact View Post
My bus came with a very old looking computer chip. Could this be that chip you are speaking of? What does it change the shift points to?
Sorry Matt, I have no rpm numbers, but it was to hold a gear to a higher rpm.
As Jeff noted the power mode is aggressive, He may have that chip.
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  #17  
Old 4 Weeks Ago
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I have a glut of ZF info in the blue box. Rebuilt in 2003, bunch of specs and such faxed from shop to owner for troubleshooting etc. attached pic of kickdown/load sensor page. Can see kickdown switch in diagram.

Second is details page for shift points, hope there’s some help in there
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-Dennis
Hesperia, California

1987 FC31 “A Rare Bird”
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1983 FC35SB
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Last edited by Dieselbird01; 4 Weeks Ago at 08:26 PM. Reason: Edited by DFB052686 Explain pics + rotated pics JW
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  #18  
Old 4 Weeks Ago
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Quote:
Originally Posted by mattafact View Post
My bus came with a very old looking computer chip. Could this be that chip you are speaking of? What does it change the shift points to?
I would bet that’s the old chip and you have the upgrade already installed.
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  #19  
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It also should be noted that the buttons are marked wrong. They should read 1, 3, 4, 5 or D, N, R. There is no button for 2 although the markings read 1, 2, 3 ,D, N, R.
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  #20  
Old 4 Weeks Ago
Bruce Bruce is offline
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Apparently both Rotella and Delo have zinc levels that are still high. The zinc is what flat tappets need.
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