Manual Transmission Problem.
Thread Starter
|
Laughing Gas
Joined: Sep 2010
Posts: 1,027
Likes: 2
From: USA
Manual Transmission Problem.
This is not an IDI. I don't know where else to go. Here is my problem:
Its a UD Diesel. 6 speed.
The problem. Not catching any gears. My driver told me it was losing power throughout the day. Unfortunately he didn't tell me as it happened. Kinda pissed about that.
The next morning I go to the truck, turn it on. Shift into 1st gear. Truck doesnt move. I try all gears, including reverse, smooth shifting, but not moving.
That clutch is new. 4 months old. So im HOPING that its not the clutch and flywheel etc.. thats all new.
The weird thing is that I can shift into ALL gears without pressing the clutch. Which is not supposed to happen. I checked the linkage cables, they are all connected.
I noticed that the drain plug on the gear box is wet and im sure has been leaking for some time.
Question is, IF the gearbox needs fluid, will it caused what I just described? I drove it myself 2-3days prior this happening, I didnt notice a problem. No grinding gears, no noticeable differences.
My 2cents is maybe the gear box ran out of fluid and is locked? I don't know how they work to be honest. I have a mechanic, but he said I need to bring him the truck. Which isn't moving.
Any transmission guys here know whats going on? I checked the linkage cable connection at the stick, they are solid. I checked at the gearbox, solid as well. I really hope it isnt the clutch.
Its a UD Diesel. 6 speed.
The problem. Not catching any gears. My driver told me it was losing power throughout the day. Unfortunately he didn't tell me as it happened. Kinda pissed about that.
The next morning I go to the truck, turn it on. Shift into 1st gear. Truck doesnt move. I try all gears, including reverse, smooth shifting, but not moving.
That clutch is new. 4 months old. So im HOPING that its not the clutch and flywheel etc.. thats all new.
The weird thing is that I can shift into ALL gears without pressing the clutch. Which is not supposed to happen. I checked the linkage cables, they are all connected.
I noticed that the drain plug on the gear box is wet and im sure has been leaking for some time.
Question is, IF the gearbox needs fluid, will it caused what I just described? I drove it myself 2-3days prior this happening, I didnt notice a problem. No grinding gears, no noticeable differences.
My 2cents is maybe the gear box ran out of fluid and is locked? I don't know how they work to be honest. I have a mechanic, but he said I need to bring him the truck. Which isn't moving.
Any transmission guys here know whats going on? I checked the linkage cable connection at the stick, they are solid. I checked at the gearbox, solid as well. I really hope it isnt the clutch.
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
What's a UD? Is this a 4x4 vehicle?
Manual transmissions don't really use "fluid". Yes, they typically take ATF as the _product_, but it's acting simply as a _lubricant_, not as hydraulic fluid like in an automatic. The gears mesh mechanically, even if there's no lubricant in it, so no, a lack of tranny lube will not cause it to fail to engage.
If the tranny were locked up, engaging it would most likely stall the engine. Clarification on "losing power" is needed - did the ENGINE fail to respond to the accelerator, or did the engine rev up as expected but fail to propel the vehicle as expected? If it's the former, then there's a performance issue not related to the transmission/clutch. If it's the latter, then it's the clutch. Ability to shift without pressing the clutch pedal points to this as well. Either it's failed, or the engage/disengage mechanism has a malfunction. Is it hydraulic, mechanical or cable?
Manual transmissions don't really use "fluid". Yes, they typically take ATF as the _product_, but it's acting simply as a _lubricant_, not as hydraulic fluid like in an automatic. The gears mesh mechanically, even if there's no lubricant in it, so no, a lack of tranny lube will not cause it to fail to engage.
If the tranny were locked up, engaging it would most likely stall the engine. Clarification on "losing power" is needed - did the ENGINE fail to respond to the accelerator, or did the engine rev up as expected but fail to propel the vehicle as expected? If it's the former, then there's a performance issue not related to the transmission/clutch. If it's the latter, then it's the clutch. Ability to shift without pressing the clutch pedal points to this as well. Either it's failed, or the engage/disengage mechanism has a malfunction. Is it hydraulic, mechanical or cable?
More Turbo
Joined: Apr 2015
Posts: 625
Likes: 13
From: W. of Seattle, Kitsap P.
It's probably this. Formerly 'Nissan Diesel':
Source: https://en.wikipedia.org/wiki/UD_Trucks
Interesting history. A lot of different models are sold in Canada and the USA.
Source: https://en.wikipedia.org/wiki/UD_Trucks
The company is a wholly owned subsidiary of the Volvo Group since 2007.[1][2] Until 2010, the company was known as Nissan Diesel, when it changed its name to UD Trucks. Already before the name change, the UD name was prominently displayed to separate the identity from that of their former owner Nissan.
On 1 February 2010, Nissan Diesel changed its name to UD Trucks.
>
The UD name was originally used for the company's Uniflow Diesel Engine (a two-stroke diesel engine), developed in 1955, but is now marketed as meaning "Ultimate Dependability".[3]
>
The UD name was originally used for the company's Uniflow Diesel Engine (a two-stroke diesel engine), developed in 1955, but is now marketed as meaning "Ultimate Dependability".[3]
Thread
Thread Starter
Forum
Replies
Last Post
