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#1
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transmission hard shifting need to let go of throttle to shift
1985 Mercedes 300 turbo diesel automatic tranny. It has a hard time shifting. Its a hard shift but i have to let go of the throttle in order for it to shift. Is their any kind of band J bolt adjustment that needs to be re-tuned or does the tranny need to come off for repair?
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#2
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Before making any band adjustments or removing the transmission you should troubleshoot your vacuum system and bowden cable. Hard shifts are usually an indication of low vacuum.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#3
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Look up bowden cable adjustment, throttle linkage adjustment and stuck kickdown solenoid.
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http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg |
#4
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Check for bad vacuum line at the transmission modulator.
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Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi |
#5
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Back it off just a little
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#6
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If I'm reading Layback correctly, you need to unscrew the bolt on your bowden cable (with a warm engine/tranny) one half to one full turn, then go for a test drive and see how it shifts. Watch the cable and make sure that as you are unscrewing it the cable is slackening. Monitor closely how far you have unscrewed it because you may want to unscrew it even more. If that doesn't help then you may want to learn the vacuum system of the 722's.
http://www.peachparts.com/Wikka/Trans722VacMod
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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had) 83' 300SD, "The Superdon" 325k+ @ 28mpg 95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg 95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head 99 Suzuki Intruder "Trudy" @ 45 mpg |
#7
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so i should do a vacuum test first by the transmission? I have a vacuum tester, should i unplug the vacuum lines by the transmission and see what psi they are blowing at? We changed the vacuum pump last year.
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