TROUBLESHOOTING
Hydraulic Pump
In most cases, problems with the drive system are not due to a defective pump but to slipping drive belts, partially engaged bypass valves, loose or damaged control linkages, etc. Be sure to check all of these before assuming a pump is faulty.The troubleshooting checklist below is designed to help determine the cause of problems.
Troubleshooting Checklist, Hydraulic Pump
WARNING!
Do not attempt any servicing or adjustments with the engine running. Take great care when inspecting drive belts, pulleys and motion control lever linkages!
Problem | Cause | Corrective action | |
Vehicle does not drive/track straight. |
| ||
| • Vehicle tires improperly inflated. | Adjust to proper pressure. | |
| • Pump linkage bent, loose or | Repair, adjust or replace the | |
|
| incorrectly adjusted. | linkages on both sides. |
| • | Bypass loose. | Tighten the bypass. |
| • | Inlet leak. | Check all connections and |
|
|
| hoses for leaks. |
Unit is noisy. | • | Engine RPM high. | Adjust the speed regulator. |
| • Oil level low or oil contaminated. | Fill to proper level or change oil. | |
| • Excessive loading (long grass). | Raise the cutting height, drive | |
|
|
| more slowly. |
| • Air trapped in the hydraulic system. | Aerate the system. | |
| • | Bypass loose. | Tighten bypass. |
| • | Inlet leak. | Check all connections and |
|
|
| hoses for leaks. |
| • | Clogged/damaged hydraulic filter. | Replace filter. |
Unit has no/low power. | • | Engine RPM low. | Adjust the speed regulator. |
| • Pump linkage bent, loose or | Repair or adjust the linkages | |
|
| incorrectly adjusted linkage system. | on both sides. |
| • Drive belt slipping or pulley | Repair/clean or replace drive belt. | |
|
| damaged. |
|
•Oil level low or oil contaminated.
•Excessive loading (long grass).
•Air trapped in the hydraulic system.
Fill to proper level or change oil.
Raise the cutting height, drive more slowly.
Aerate the system.