Section 250-0260
SM 1508 9-98
5
Braking System - Pressure Converter
MAINTENANCE
Note: Maintenance and adjustment of the brake
system is contained in Section 165-0010, BRAKE
PARTS.
Every 10 hours/Daily
Inspect brake fluid level in remote mounted brake fluid
reservoirs and add if low. Refer to Section 300-0020,
LUBRICATION SYSTEM, for fluid specification.
Check air and hydraulic lines to the pressure
converters for leaks and/or wear. Tighten line fittings
or replace as required.
hydraulic cylinder body (21).
3. Install hydraulic line in port 'D' of end cap (12).
4. Install breather hose assembly in port 'B' of
hydraulic cylinder body (21).
5. Install air supply line in port 'A' of air cylinder body (1).
6. Install electrical wire on contact assembly (17) in
hydraulic cylinder body (21).
7. Fill remote mounted brake fluid reservoir with fluid,
as specified in Section 300-0020, LUBRICATION
SYSTEM. Bleed brakes as described in
Section 165-0010, BRAKE PARTS.
PRESSURE CONVERTER DIAGNOSIS
CONDITION REASON REMEDY
Air cylinder leak, other than at Worn leather cup Replace cup.
Dent or corrosion in cylinder Repair or replace cylinder body.
body
Loose piston on push rod Replace piston and push rod assembly.
Internal pressure leak in Pitted cylinder, worn valve Replace cylinder assembly if pitted. Replace
hydraulic cylinder. This is seal or worn hydraulic piston worn seals.
indicated by creep or stroke seal
travel during extended holding
application at low pressure.
Fluid leak at rear of hydraulic Cylinder pitting Replace cylinder.
Worn end cap seal Replace seal.
Hydraulic pressure builds and Hydraulic piston passage Clean or replace hydraulic piston.
fails to release (brakes lock up) blocked by dirt or corrosion
Swollen valve insert which Replace valve insert.
expands over hydraulic piston
passage. Caused by improper Drain and flush brake hydraulic system. Fill
or contaminated brake fluid. with clean brake fluid, as specified in
Section 300-0020, LUBRICATION SYSTEM.
Bleed brake system, as specified in
Section 165-0010, BRAKE PARTS.
Stroke too long Air in hydraulic lines Bleed brake system, as specified in
Section 165-0010, BRAKE PARTS.
inlet fitting
cylinder
Courtesy of Machine.Market
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