| (11) Valve (Brake Pump Unloader) (12) Solenoid Valve (Brake Pump Unloader) (13) Relief Valve (Main)(14) Solenoid Valve (Brake Accumulator Purge) |
| (11) Valve (Brake Pump Unloader) (12) Solenoid Valve (Brake Pump Unloader)(14) Solenoid Valve (Brake Accumulator Purge) |
| (13) Relief Valve (Main)(14) Solenoid Valve (Brake Accumulator Purge) |
| (11) Valve (Brake Pump Unloader) (12) Solenoid Valve (Brake Pump Unloader) (13) Relief Valve (Main)(14) Solenoid Valve (Brake Accumulator Purge) |
| (11) Valve (Brake Pump Unloader)(12) Solenoid Valve (Brake Pump Unloader) |
| Problem: EID 525 High Brake Pump Pressure Event is active if the brake pump pressure is greater than 3000psi for more than 90 seconds. | ||||
| Component | Possible Component Root Causes | Non-Component Root Causes | How to Diagnose | Corrective Action |
| Solenoid Valve (Brake Pump Unloader) (12) | Valve improperly installed causing screen damage | Contamination: Brake system oil significantly dirtier than ISO 18/15 | Open circuit/short to ground fault codes logged in ET. Measure coil resistance when cool 20° C (68° F). The resistance should be close to 32 ± 2 ohms. | Replace Solenoid Valve (Brake Pump Unloader) (12). |
| Harness connector not locked in place | Stuck Closed: Measure actual brake pump pressure. Install 5000psi gauge on brake pump pressure tap. Brake pump pressure at 3250 ± 50psi relief pressure constantly. | |||
| Partially stuck closed | Locking tab broken on mating connector. | Remove the access plug for OR1. Install a 5000psi gauge. Pressure at OR1 is the same as (stuck closed) | ||
| Bent or damaged solenoid valve. | Remove solenoid and visually inspect screen for damage. | Make sure that oil is ISO 18/15 or better. If more than two ISO codes high, kidney loop machine and change filter. If kidney loop not available, change oil. | ||
| Valve (Brake Pump Unloader) (11) | Stuck Closed | Contamination: Brake system oil significantly dirtier than ISO 18/15 | Stuck Closed: Measure actual brake pump pressure. Install 5000psi gauge on brake pump pressure tap. Brake pump pressure at 3250 ± 50psi relief pressure constantly. | Replace Valve (Brake Pump Unloader) (11). |
| Remove the access plug for OR1. Install a 5000psi gauge. Pressure at OR1 is less than (stuck closed) brake pump pressure. | Make sure that oil is ISO 18/15 or better. If more than two ISO codes high, kidney loop machine and change filter. If kidney loop not available, change oil. | |||
| Relief Valve (Main) (13) | Contamination: Brake system oil significantly dirtier than ISO 18/15 | Increase Relief Valve (Main) (13) pressure setting. | ||
| Pressure Setting Drifting Low causing a stalled charge | Replace Relief Valve (Main) (13). | |||
| Drifting Low: Measure actual brake pump pressure. Install 5000psi gauge on brake pump pressure tap. Brake pump pressure below Brake Accumulator cut out pressure (3000psi). Low Idle Charging may stall or charge time be extended. | Make sure that oil is ISO 18/15 or better. If more than two ISO codes high, kidney loop machine and change filter. If kidney loop not available, change oil. | |||
| Brake Accumulator Pressure Sensors | Harness connector not locked in place | With machine off, verify that the sensors are reading less than 75psi. | Replace Brake Accumulator Pressure Sensors. | |
| Failed In Range / Stuck at one pressure (sensor tells ECM to continue to charge when in fact it should be telling the ECM to cut out) | Locking tab broken on mating connector. | Install 5000psi gauge on the brake accumulator pressure taps in order to verify that the accumulator pressure matches the gauge pressure. With machine running at low idle check to see if the gauge matches the sensor in ET. | ||
| Brake Pump Pressure Sensors | Failed In Range / Stuck at one pressure | Harness connector not locked in place | With machine off, verify that the sensors are reading less than 75psi. | Replace Brake Pump Pressure Sensors. |
| Locking tab broken on mating connector. | Install 5000psi gauge on the brake accumulator pressure taps in order to verify that the accumulator pressure matches the gauge pressure. With machine running at low idle check to see if the gauge matches the sensor in ET. | |||
| OR1 Orifice | Orifice plug loose | Remove OR1 Access plug and inspect. | ||
| seal damaged. | Measure actual brake pump pressure. Install 5000psi gauge on brake pump pressure tap. Brake pump pressure at 3250 ± 50psi relief pressure constantly. | Remove OR1 Plug and basket screen from port. Replace O-ring on plug and reinstall. | ||
| Filter Element | Damaged on Installation | System Overheating | Remove filter element and inspect for damage and loose pieces of yellow plastic. Remove and inspect Accumulator purge solenoid screens for debris. | Contact product support through the DSN. |
MARYGAR
0 comments:
Post a Comment