INSTALLATION INSTRUCTIONS
Bleeding Hydraulic Brake System
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Turn crane power ON so that the FRB bleeder solenoid can be operated. If air/hydraulic system is used, the air system must be piped and wired with power ON and with normal air pressure.
Brake fluid is drawn from the FRB reservoir through the static return line to the master cylinder and pumped through the brake system pressure line. The reservoir must initially be completely full of fluid as per filling instructions above. The FRB reservoir must be kept full during the bleeding operation.
Each successive full cylinder stroke forces fluid farther downstream. The master cylinder must be stroked enough times to force fluid through the complete brake system. Volume of the 5/16" OD tubing is 0.6 in3 per foot. With the control cylinder brake pedal temporarily set for maximum 17" pedal travel, or the pressure cluster operated at full 1-1/2" stroke, displacement is as follows:
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| ASSEMBLY |
MAX DISPLACEMENT |
FILLED PRE STROKE
LENGTH OF TUBING |
J-16320
J-17616
J-54085 or 6 |
1-1/2" Dia. Control Cylinder
1-3/4" Dia. Control Cylinder
1-3/4" Dia. Pressure Cluster |
3.4 in3
4.6 in3
5.7 in3 |
5 ft.
7 ft.
9 ft. |
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Example: Brake System using JF-17616 control cylinder, with 70-foot pressure line from cylinder to brake and to FRB bleeder, must be fully stroked at least 10 times to fill the complete system.
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- Depress BPB bleeder pushbutton to unseat the FRB bleeder check valve.
- Step on control cylinder brake pedal through full 17" travel, or stroke pressure cluster on panel forward (see panel installation instructions). Keep foot on pedal or keep pressure cluster stroked forward.
- Disengage BPB (bleeder pushbutton).
- Remove foot from pedal or retract pressure cluster.
- Repeat steps 1-4 enough times to fill the complete system. Remember, fluid travel is only 5 to 7 feet. The above cycle must be performed enough times to fill the entire length of interconnecting tubing.
- Refill FRB reservoirs frequently during bleeding sequences to prevent reinjecting air in system.
- The brake system is completely bled when the system is operated without operating the bleeder pushbutton and the brake pedal has a solid feel after less than 8" pedal travel, or if the pressure cluster stroke indicator shows less than 1-1/2" travel.
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- Reset brake pedal for comfortable operator height and to provide approximately 8" maximum travel.
- NOTE: Manually operated type HM systems require a special bleeding procedure in addition to above steps. After the service brake system is bled:
- Temporarily attach a bleeder hose to the bleeder screw on the HM brake releasing cylinder and open the bleeder screw.
- Pump the brake pedal until only clear fluid is expelled from the releasing cylinder bleeder screw. Do not open the service brake bleeder during this step.
- Close the releasing cylinder bleeder screw and repeat at the second HM brake, if used.
- Refill FRB reservoir to within 1" of opening and replace filler cap and gasket.
It is recommended that the brake system be
re-bled after a short period of operation. |