Brakes Flashcards
What do manual brake systems rely on?
A keep full reservoir
What was the keep full reservoir replenished by?
A small orifice that was connected to either the lube circuit on open station tractor or the steering return circuit on sound guard body’s
What was the keep full reservoir replenished by?
A small orifice that was connected to either the lube circuit on open station tractor or the steering return circuit on sound guard body’s
What was a larger reservoir in the system for?
To maintain the oil level of the keep full and ensure no back pressure
What was a larger reservoir in the system for?
To maintain the oil level of the keep full and ensure no back pressure
What is the approximate mechanical advantage ratio of the manual braking system?
6 : 1
What is the purpose of the equalizer check in the manual brake system?
To allow the brake pressure to be felt at the opposite side equalizer check
When the operator releases the pedal, where does the oil flow on the manual brake system?
Oil returns from the brake piston through the residual check valve orifice slowing the flow of oil to prevent air entry past the brake piston seals
For proper pedal adjustment, what must be done before adjusting the pedal stop?
The brake system must be bled
What must you remember when applying pressure to the brake pedal when adjusting?
Always apply the force to the opposite pedal from the one you are adjusting the stop for
What is the spec for pedal drop when adjusting?
Each pedal should not drop over 1 inch in 1 minute with 60 pounds of pedal effort
What would be the problem if you had poor braking action/noise with a solid pedal feel?
The failure of the friction material of the brake disc
What would be the cause for the brake pedals to settle during application?
External leakage from lines and fittings or internal leakage at the axle or brake valves
To isolate the brake valve assembly from the axle, what must you do?
Disconnect the brake lines and cap off the fittings on the outlet side of the brake valve
What will this do for diagnosing a leak?
If when applying the pedals they always remain solid with no settling the problem is in the brake piston area of the rear axle
What type of brake valve does the 6000 series tractors use?
Manual hydraulic brake valve
What is the main purpose or biggest advantage of the manual hydraulic brake valve?
Provides several stages of operation to provide quick application and yet high capacity braking action without a large amount of pedal travel
What is the starting psi in the manual hydraulic brake valve?
Approximately 85 psi and is providing a quick fill of the brake piston chamber
When a single pedal is actuated, the large and small pistons are moved inwards together causing what?
The inlet valve is closed by movement of the small piston and equalizing valve is pushed open
How much psi does it take to overcome the piston, retractors and sealed drag to move the piston to take up the clearance?
44 psi
On the manual hydraulic brake valve at what psi does the low pressure regulator cone get pushed off its seat?
- Psi
At which psi will the pressure overcome the regulator plunger, large spring on the manual hydraulic brake valve?
Between 145 and 365 psi
On the manual hydraulic brake valve what is the spec for pedal play?
Must be between 0.15 and 0.20 mm or .006 - .008”
What is extremely important when adjusting the pedal adjustment?
Make sure both pedals are locked together
