What is the hydraulic system on a grader?

THE GRADER HYDRAULIC SYSTEM The hydraulic pump is driven at the flywheel end of the engine. Flow from the pump is directed to the flow regulator. At the flow regulator, 8 GPM (5.5 GPM on 503—A & L and 5 GPM on 303—A) is directed to the steering valve. The T400—A and 503—A & L graders utilize the full—hydraulic (Orbitrol) steering valve.

What to do if your hydraulic system fails?

Distortion of valve body 1. Drain and flush system. Disassemble and clean, if necessary. 2. Small fittings or pipe. 3. Check pilot pressure system. 4. Check for proper source voltage and frequency. Remove solenoid and check fields. 5. Align body and piping to remove strains. VALVE SPOOL FAILS TO MOVE 1. Dirt in system 2. Blocked drain 3.

Where is the hydraulic pump located on a T400 grader?

The hydraulic pump is driven at the flywheel end of the engine. Flow from the pump is directed to the flow regulator. At the flow regulator, 8 GPM (5.5 GPM on 503—A & L and 5 GPM on 303—A) is directed to the steering valve. The T400—A and 503—A & L graders utilize the full—hydraulic (Orbitrol) steering valve.

What should the temperature of a hydraulic system be?

This can occur well below 180°F, depending on the fluid’s viscosity grade. To achieve stable fluid temperature, a hydraulic system’s capacity to dissipate heat must exceed its heat load.

What kind of brakes does a 303 grader have?

The 303—A grader utilized the hydraulic-mechanical (Sheppard) steering gear. All other models utilize the hydraulic-mechanical (Ross) gear. Graders equipped with four-wheel power-boosted brakes use the return flow from the steering valve to actuate the brake power booster.

How does a clogging indicator work on a hydraulic system?

This requires a mechanism to monitor the restriction to flow (pressure drop) across the filter element and alert you when this point is reached. A clogging indicator is the crudest form of this device. A better solution is continuous monitoring of pressure drop across the filter.

How does a grader brake power booster work?

Graders equipped with four-wheel power-boosted brakes use the return flow from the steering valve to actuate the brake power booster. Previous units were plumbed with the brake power booster preceding the steering valve. Pump flow in excess of the 8 GPM supplied to the steering sys tem is directed to the control manifold.

How can you tell when a hydraulic filter needs to be changed?

The only way to know when the oil needs to be changed is through oil analysis. A similar situation applies to hydraulic filters. If you change them based on schedule, you’re changing them either too early or too late.

Can a clogged intake line cause a hydraulic failure?

In extreme cases, cavitation can cause mechanical failure of system components. While cavitation can occur just about anywhere within a hydraulic circuit, it commonly occurs at the pump. A clogged inlet strainer or restricted intake line will cause the fluid in the intake line to vaporize.

What are the symptoms of a hydraulic system problem?

A reduction in machine performance is often the first indication that there is something wrong with a hydraulic system. This usually manifests itself in longer cycle times or slow operation. It is important to remember that in a hydraulic system, flow determines actuator speed and response. Therefore, a loss of speed indicates a loss of flow.

What do you need to know about Caterpillar motor graders?

This Caterpillar 12G, 120G, 130G, 140G Motor Graders service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Each section covers a specific component or system with detailed illustrations.

Who is responsible for the 12 grader Operators Manual?

Operator’s Manual 12 Motor Grader S/n 99E1 & up THIS IS A MANUAL PRODUCED BYJENSALES INC. WITHOUT THE AUTHORIZATION OF CATERPILLAR OR IT’S SUCCESSORS. CATERPILLAR AND IT’S SUCCESSORS ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.

Where does the flow from a grader pump go?

Flow from the pump is directed to the flow regulator. At the flow regulator, 8 GPM (5.5 GPM on 503—A & L and 5 GPM on 303—A) is directed to the steering valve. The T400—A and 503—A & L graders utilize the full—hydraulic (Orbitrol) steering valve. The 303—A grader utilized the hydraulic-mechanical (Sheppard) steering gear.

What are the features of a 120K motor grader?

2 The 120K optimizes your investment by delivering maximum productivity and durability. The Cat C7 engine, direct-drive power shift transmission and load-sensing hydraulics work together to ensure the power and precision to get the job done. 120K Features

What makes the Volvo G900 a good grader?

By listening to customer needs and responding with design innovations like the industry’s first 11-speed grader transmission with autoshift, the Volvo continuous improvement program leads the G900 family to ongoing quality leadership. At home in the Volvo fleet From end-to-end, from the ground up,

How many GPM does a T400 grader have?

At the flow regulator, 8 GPM (5.5 GPM on 503—A & L and 5 GPM on 303—A) is directed to the steering valve. The T400—A and 503—A & L graders utilize the full—hydraulic (Orbitrol) steering valve. The 303—A grader utilized the hydraulic-mechanical (Sheppard) steering gear. All other models utilize the hydraulic-mechanical (Ross) gear.

What are the symptoms of a hydraulic system failure?

Many of the failures in a hydraulic system show similar symptoms: a gradual or sudden loss of high pressure, resulting in loss of power or loss of speed in the cylinders. The cylinder (s) may not move at all, or if they do they may move too slowly or may stall under light loads.

What is the hydraulic system on a grader?