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| Illustration 1 | g06255040 |
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Hydraulic schematic for the braking system (1) Brake release cylinder (2) Pressure tap for the brake release system (3) Line to pilot circuit (4) Parking brake control valve (5) Parking brake oil pressure sensor (6) Pressure tap for the parking brake circuit (7) Front wheel brakes (8) Brake accumulator charging valve (9) Brake accumulator oil pressure switch - alert indicator (10) Pressure tap for the parking brake circuit (11) Check valve (12) Parking brake oil pressure switch (13) Brake accumulator oil pressure switch - brake application (14) Check valve (15) Portable hydraulic pump quick connect coupler (16) Brake accumulators (17) Service brake oil pressure sensor (Rear) (18) Service brake oil pressure sensor (Front) (19) Residual brake oil pressure switch (20) Service brake and transmission neutralizer pedal (21) Service brake pedal (22) Pressure tap for the brake accumulator circuit (23) Service brake oil pressure switch (24) Pilot oil pressure relief valve (25) Portable hydraulic pump quick connect coupler (26) Check valve (27) Breaker relief valve (28) Brake accumulators (29) Service brake control valve (30) Residual brake oil pressure switch (31) Rear wheel brakes (32) Pilot oil filter (33) Pressure tap for the pilot circuit (34) Pressure tap for the brake accumulator circuit (35) Engine overspeed control valve (36) Pilot and braking pump (37) Hydraulic filters (38) Hydraulic tank (39) Service brake return valve | |
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| Illustration 2 | g06107322 |
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Location of the braking system components (1) Brake release cylinder (4) Parking brake control valve (7) Front wheel brakes (8) Brake accumulator charging valve (9) Brake accumulator oil pressure switch - alert indicator (13) Brake accumulator oil pressure switch - brake application (16) Brake accumulators (24) Pilot oil pressure relief valve (27) Breaker relief valve (28) Brake accumulators (29) Service brake control valve (31) Rear wheel brakes (32) Pilot oil filter (36) Pilot and braking pump (38) Hydraulic tank (39) Service brake return valve | |
The braking system has two brake control circuits operating four-wheel brakes on the machine. The two circuits are the service brake circuit and the parking brake circuit.
The main components of the service brake circuit are hydraulic tank (38), pilot and braking pump (36), brake accumulator charging valve (8), brake accumulators (16), and (28), service brake control valve (29), front wheel brakes (7), rear wheel brakes (31), engine overspeed control valve (35), and service brake return valve (39).
The main components of the parking brake circuit are hydraulic tank (38), pilot and braking pump (36), pilot oil filter (32), pilot oil pressure relief valve (24), parking brake control valve (4), front wheel brakes (7), and rear wheel brakes (31).
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| Illustration 3 | g06163941 |
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(38) Hydraulic tank (behind guard)
(40) Filler cap | |
Hydraulic tank (38) is on the right side of the machine behind the hydraulic tank guard. Oil is added to the tank through filler cap (40).
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| Illustration 4 | g06107329 |
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(27) Breaker relief valve
(38) Hydraulic tank | |
Breaker relief valve (27) is on hydraulic tank (38).
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| Illustration 5 | g06107331 |
| (36) Pilot and braking pump | |
Pilot and braking pump (36) are part of a two section, gear type pump mounted on the torque converter updrive housing.
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| Illustration 6 | g06107334 |
| (8) Brake accumulator charging valve | |
Brake accumulator charging valve (8) is on the left side of the rear frame.
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| Illustration 7 | g06107335 |
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(16) Brake accumulators
(28) Brake accumulators | |
A total of four brake accumulators are installed on the left side of the rear frame. Two brake accumulators (16) and two brake accumulators (28).
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| Illustration 8 | g06107336 |
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(20) Service brake and transmission neutralizer pedal
(21) Service brake pedal (29) Service brake control valve (not shown) | |
Service brake and transmission neutralizer pedal (20) and service brake pedal (21) are on the floor of the operator station. Service brake control valve (29) is under the floor of the operator station.
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| Illustration 9 | g06107344 |
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(24) Pilot oil pressure relief valve
(32) Pilot oil filter | |
Pilot oil pressure relief valve (24) and pilot oil filter (32) are on the rear frame cross beam.
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| Illustration 10 | g06107348 |
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(4) Parking brake control valve
(6) Pressure tap for the parking brake circuit (10) Pressure tap for the parking brake circuit | |
Parking brake control valve (4) is on the left side of the rear frame.
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| Illustration 11 | g06192643 |
| (35) Engine overspeed control valve | |
Engine overspeed control valve (35) is on the left side of the rear frame.
Reference: For more information on the engine overspeed control valve, refer to Systems Operation Testing and Adjusting, "Engine Overspeed Control".
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| Illustration 12 | g06163940 |
| (39) Service brake return valve | |
Service brake return valve (39) is on the left side of the transmission compartment.