What year is the SD? Does the oil pan have four bolts, or six bolts? ('81 and up should have the six-bolt pan transmission.)
At the transmission dipstick, is the fluid pink, red/dark red, or brown? Does it have a burnt smell? Is it at the proper level (checked when the car is fully warmed up)?
When was the last time the fluid/filter have been changed?
Depending on the answers to these questions, you may need to drop the pan and check for any large amounts of debris. There really isn't anything to adjust on these transmissions for the forward gears, outside of the vacuum modulator and kick-down linkage, which would adjust only the timing and quality of the shifts, not the ability to shift.
Usually, a failure to shift into the top gear is caused by front clutch failure; either by a burned out clutch pack or a blown piston seal. A transmission shop can check the operation of the clutch pack by applying air pressure to the passageway from the valve body that the feeds the piston. (You can do this yourself, if you have access to compressed air, and know where to apply the pressure....)
Mark in Lakewood, CO
From: "terryt_97" <terrytan@earthlink.net>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Saturday, October 8, 2011 9:22:02 AM
Subject: [diesel_mercedes] Having trouble getting into drive mode
At the transmission dipstick, is the fluid pink, red/dark red, or brown? Does it have a burnt smell? Is it at the proper level (checked when the car is fully warmed up)?
When was the last time the fluid/filter have been changed?
Depending on the answers to these questions, you may need to drop the pan and check for any large amounts of debris. There really isn't anything to adjust on these transmissions for the forward gears, outside of the vacuum modulator and kick-down linkage, which would adjust only the timing and quality of the shifts, not the ability to shift.
Usually, a failure to shift into the top gear is caused by front clutch failure; either by a burned out clutch pack or a blown piston seal. A transmission shop can check the operation of the clutch pack by applying air pressure to the passageway from the valve body that the feeds the piston. (You can do this yourself, if you have access to compressed air, and know where to apply the pressure....)
Mark in Lakewood, CO
From: "terryt_97" <terrytan@earthlink.net>
To: "diesel mercedes" <diesel_mercedes@yahoogroups.com>
Sent: Saturday, October 8, 2011 9:22:02 AM
Subject: [diesel_mercedes] Having trouble getting into drive mode
Am experiencing shift to drive mode. Checked all vacuum lines.
300SD with 245K shifts into 2nd and 3rd normally but stays on 3rd and will not shift to fourth or drive. Is there any adjusments or do I need to change transmission fluid ? Thanks for any help.
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