ROLLER GP-TRACK CARRIER 2P3514 - Caterpillar

Supplemental Steering Pump (10) (Location)Flow switch (11) and Check valve (12) are mounted on the same block under the platform. Check valve (12) prevents supplemental steering pump (10) oil flow from entering steering/brakes pump section (8). Flow switch (11) activates the primary steering fault light which warns the operator of a failure in primary steering pump section (8) or lines. The switch activates (opens) when the oil flow by it is approximately 10.9 liter/min (2.8 U.S. gpm). The switch deactivates (closes) when the oil flow by it is approximately 7.6 liter/min (2.0 U.S. gpm). When the flow switch deactivates (closes), the primary steering fault light will illiminate.
(11) Flow Switch. (12) Check Valve.Optional Components
The optional components are: check and relief valve (A), flow switch (B), and check valve (C).1. Check and relief valve (A) protects the steering system from high pressures caused by sudden forces against the tires of the machine. The relief valve pressure setting is 25 000 kPa (3650 psi).2. Flow switch (B) is located on supplemental steering pump (10). Flow switch (B) activates the supplemental steering fault light which warns the operator of a failure in supplemental steering pump (10) or the related lines. The switch activates (closes) when the oil flow by it is approximately 11 liter/min (2.9 U.S. gpm). The switch deactivates (opens) when the oil flow by it is approximately 4.9 liter/min (1.3 U.S. gpm). When the flow switch deactivates (opens), the supplemental steering fault light will illuminate.3. Check valve (C) reduces the hydraulic kickback which occurs while steering the machine and hitting a large bump with a wheel.Supplemental Steering Pump
Schematic of Supplemental Steering Pump
(1) Check valve. (2) Pump shaft drive gear. (3) Discharge port. (4) Check valve. (5) Check valve. (6) Check valve. (7) Driven gear. (8) Suction port.The supplemental steering pump is a gear-type pump that is ground-driven through the transfer gears. When the machine moves forward or backward oil is sent into the steering system from discharge port (3).When pump shaft drive gear (2) turns clockwise, gears (2) and (7) pull oil in suction port (8), past check valve (5) and around the pump gears. Check valve (1) prevents oil from being pulled in through discharge port (3). Oil around the gears is sent through check valve (4) and out discharge port (3). Check valve (6) prevents oil flow back through the pump.When pump shaft drive gear (2) turns counter-clockwise, gears (2) and (7) pull oil in suction port (8), past check valve (6) and around the gears. Check valve (4) prevents oil from being pulled in through discharge port (3). Oil around the gears is sent through check valve (1) and out discharge port (3). Check valve (5) prevents oil flow back through the pump.Brake System
Brake Hydraulic System Schematic
(1) Hydraulic line to HMU. (2) Hydraulic line from HMU. (3) Flow control/relief valve. (4) Power cylinder. (5) Implement hydraulic line. (6) Tank return line. (7) Hydraulic tank and filter. (8) Steering/brakes section of