Advertisement
Operation
Pressure Releasing Spring
Some tractors hydraulic systems keep a small amount of pressure in the hydraulic
lines even when the control lever is set to "float" position. A pressure releasing
spring is used to counteract the hydraulic pressure coming from the tractor.
Brake Operation
Tractors with "closed center or open center" hydraulic circuit.
1. To apply the brakes, the lever must be pulled fully backward.
2. To release the brakes, the lever must be pushed fully forward to the "float
position".
Inspection Of Braking Fluid Level
If the spring is compressed down to 8" or less when braking, add hydraulic fluid as
per "Fill Instructions for Master Cylinder".
Fill Instructions for Master Cylinder
The master cylinder of the braking system is designed to create a vacuum in the
hydraulic lines leading to the calipers. When the brakes are fully released, the
vacuum created pulls the piston of the calipers to fully retract, which disengages the
brakes on the unit. To do so, the master cylinder must never be full of hydraulic
fluid when braking.
1. Attach jumper hose #72182 to ("A" port) and ("B" port).
2. Connect the 1/4" hydraulic hoses to the tractor.
3. Open ball valve to ("A" port).
4. Apply and hold pressure to braking system from tractor hydraulics.
5. Relieve all pressure from the 1/4" hydraulic lines from the tractor for the braking
system.
6. Close Ball Valve to ("A" port).
7. Remove jumper hose #72182 from ("A" port) and ("B" port).
8. Apply and hold pressure to braking system.
9. Open bleeder screw on any brake caliper.
(This will allow the master cylinder spring to compress down to 14" long.
10. When the master cylinder has compressed down to 14" long, tighten bleeder
screw.
Braking System
38
When the master is
fully extended, the
pressure release
spring measures
roughly 16" long
.
When adding
braking fluid to the
master cylinder for
the last time, the
pressure releasing
spring must be
held compressed at
14" long.
Advertisement
