Hey folks,
This '74 Case 850 is almost impossible to steer using the brake pedals. It does somewhat ok on an upgrade, it becomes harder to brake on level ground, but when traveling in reverse on a downgrade it takes all my might to disengage the tracks (thus no turning or braking) ability. The following photo is its Transmission Control Valve (TCV)
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We have all new seals that goes in the TCV, fairly new master cylinders & slave cylinders. We have bled out all the air in the brake lines. The slave cylinders & brake levers does operate with the brake pedal. I removed the back plate (#2) on the TCV & the brake spools (#10) do function with the brake pedals. All the mechanical(s) check-out.
My 5,000 page service manual states "Check to see if the spools fit their respective bores with a slight hand pressure & w/o excessive side clearance". That is not a very scientific description! They should have included wear limits in this manual - especially when it comes to brakes.
Does any1 know how much is too much?
The min spool diameter?
The max bore diameter?
Can just enough fluid pass through worn spools to make the drive train clutches only partially disengage? such as clutch slippage.
What else can cause the tracks to keep driving when the brakes are depressed?
This '74 Case 850 is almost impossible to steer using the brake pedals. It does somewhat ok on an upgrade, it becomes harder to brake on level ground, but when traveling in reverse on a downgrade it takes all my might to disengage the tracks (thus no turning or braking) ability. The following photo is its Transmission Control Valve (TCV)
We have all new seals that goes in the TCV, fairly new master cylinders & slave cylinders. We have bled out all the air in the brake lines. The slave cylinders & brake levers does operate with the brake pedal. I removed the back plate (#2) on the TCV & the brake spools (#10) do function with the brake pedals. All the mechanical(s) check-out.
My 5,000 page service manual states "Check to see if the spools fit their respective bores with a slight hand pressure & w/o excessive side clearance". That is not a very scientific description! They should have included wear limits in this manual - especially when it comes to brakes.
Does any1 know how much is too much?
The min spool diameter?
The max bore diameter?
Can just enough fluid pass through worn spools to make the drive train clutches only partially disengage? such as clutch slippage.
What else can cause the tracks to keep driving when the brakes are depressed?