Innovative Braking and Controls Worldwide Hydraulic Master Cylinders ange mount and side mount, straight-bore and two-stage cylinders Hydraulic Cylinders for Mobile and Industrial Applications MICO, Inc.

Why choose MICO? MICO, Inc. designs, manufactures and markets hydraulic components, controls, and brake systems primarily for off-road markets. We have manufacturing facilities in: • • • Product lines we specialize in include: • • • • • • • • North Mankato, Minnesota U.S.A. Ontario, California U.S.A. Empalme, Sonora, Mexico Many of the world’s largest off-highway OEMs value the knowledgeable staff at MICO and work with us to make their products better. Our custom-engineered products are designed with the customer requirements as the primary driver. It is our intent to help customers build their...

Swing Drive Equipment Agricultural Equipment Heavy Construction Equipment Mining Equipment Forestry Equipment In-Plant & Warehouse Equipment Airport Support Vehicles

Operation of straight-bore MICO Master Cylinders Non-Actuated Position (Refer to Figure 1) When the brake pedal is completely released, the master cylinder is in a static position. The cylinder bore and reservoir are equalized at atmospheric pressure because air vent (6) and equalizing port (1) are open. (Models that use a filler cap designed for a remote reservoir must use a vented cap on the remote reservoir). Residual check valve (2) is closed and sealed against check valve seat (3) causing the vehicle brake system to remain at residual pressure (approximately 8-16 PSI). Residual pressure...

Equalizing Port Residual Check Valve Check Valve Seat Piston Piston Cup Air Outlet Outlet Port Spring Hydraulic Fluid

Operation of two-stage MICO Master Cylinders (Low Pressure Relief Valve) Non-Actuated Position (Refer to Figure 4) When the brake pedal is completely released, the master cylinder is in a static position. The low and high pressure bores (11 & 12) and reservoir are equalized at atmospheric pressure because air vent (8) and equalizing port (2) are open. (Models that use a filler cap designed for a remote reservoir must use a vented cap on the remote reservoir.) Residual check valve (5) is closed and sealed against check valve seat (7) causing the vehicle brake system to remain at residual pressure...

Relief Valve Equalizing Port High Pressure Piston Seat Residual Check Valve Outlet Port Check Valve Seat Air Vent Low Pressure Piston Low Pressure Cup Low Pressure Bore High Pressure Bore High Pressure Cup Metering Pin Relief Valve Piston Replenishing Port Disc Check Valve Relief Valve Port Hydraulic Fluid

Operation of two-stage MICO Master Cylinders (High Pressure Relief Valve) Non-Actuated Position (Refer to Figure 4) When the brake pedal is completely released, the master cylinder is in a static position. The low and high pressure bores (11 & 12) and reservoir are equalized at atmospheric pressure because air vent (8) and equalizing port (2) are open. (Models that use a filler cap designed for a remote reservoir must use a vented cap on the remote reservoir.) Residual check valve (5) is closed and sealed against check valve seat (7) causing the vehicle brake system to remain at residual pressure...

Relief Valve Equalizing Port High Pressure Piston Seat Residual Check Valve Outlet Port Check Valve Seat Air Vent Low Pressure Piston Low Pressure Cup Low Pressure Bore High Pressure Bore High Pressure Cup Reservoir Port Disc Check Valve Pilot Line Relief Valve Piston Metering Pin Hydraulic Fluid

Choosing the Proper Cylinder Straight-bore Master Cylinder Displacement Fluid displacement from master cylinders can be determined by square inch area of the bore multiplied by stroke. Two-stage Master Cylinder Displacement Initial fluid displacement from the two-stage master cylinder is caused by movement of the large diameter piston until the relief valve opens. When the relief valve opens, fluid displacement by the large diameter piston is diverted into the reservoir. At this point further fluid displaced from the two-stage master cylinder is from the high pressure bore (small diameter piston)....

Straight-bore Master Cylinders millimeters inches Typical model show. Dimensions may vary slightly between units. SPECIFICATIONS Model Number Bore Diameter Effective Stroke Fluid Type Push Rod (refer to page 33) Boot (refer to page 33) Residual Check Valve Outlet Port None None HO = mineral base hydraulic oil. + Reservoir has 1/8-27NPTF remote reservoir port. Contact MICO, Inc. for available outlet port adapters.

Straight-bore Master Cylinders Typical model show. Dimensions may vary slightly between units. millimeters inches SPECIFICATIONS Model Number Bore Diameter Effective Stroke Fluid Type Push Rod (refer to page 33) Boot (refer to page 33) Residual Check Valve Outlet Port None None None 29-020-033 None HO = mineral base hydraulic oil. BF = DOT 3, 4, 5 and 5.1 brake fluid. Contact MICO, Inc. for available outlet port adapters.

Straight-bore Master Cylinders Typical model show. Dimensions may vary slightly between units. millimeters inches SPECIFICATIONS Model Number Bore Diameter Effective Stroke Fluid Type Push Rod (refer to page 34) Boot (refer to page 33) Residual Check Valve Outlet Port None None 30-020-020 None None None 32-570-065 None HO = mineral base hydraulic oil. BF = DOT 3, 4, 5 and 5.1 brake fluid. + Has one filler cap tapped (1/4-18NPTF) for remote reservoir port. Contact MICO, Inc. for available outlet port adapters.

Straight-bore Master Cylinders Typical model show. Dimensions may vary slightly between units. millimeters inches SPECIFICATIONS Model Number Bore Diameter Effective Stroke Fluid Type Push Rod (refer to page 34) Boot (refer to page 33) Residual Check Valve Outlet Port BF = DOT 3, 4, 5 and 5.1 brake fluid. Contact MICO, Inc. for available outlet port adapters.

Straight-bore Master Cylinders Typical model show. Dimensions may vary slightly between units. millimeters inches SPECIFICATIONS Model Number Bore Diameter Effective Stroke Fluid Type Push Rod (refer to page 34) Boot (refer to page 33) Outlet Port HO = mineral base hydraulic oil. BF = DOT 3, 4, 5 and 5.1 brake fluid. Contact MICO, Inc. for available outlet port adapters.