Ride-On Lawn Mower Workshop Manual

English-66
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
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. 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.
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!