Service and Repairs
General Precautions for Removing and Installing Hydraulic System Components
Before Repair or Replacement of Components
1.Before removing any parts from the hydraulic sys- tem, park machine on a level surface, engage parking brake, lower cutting deck or attachments and stop en- gine. Remove key from the ignition switch.
2.Clean machine before disconnecting, removing or disassembling any hydraulic components. Make sure hydraulic components, hoses connections and fittings are cleaned thoroughly. Always keep in mind the need for cleanliness when working on hydraulic equipment.
CAUTION
Operate all hydraulic controls to relieve system pressure and avoid injury from pressurized hy- draulic oil. Controls must be operated with the ignition switch in RUN and the engine OFF. Make sure all electrically operated control valves are actuated. Return ignition switch to OFF when pressure has been relieved. Remove key from the ignition switch.
3.Put caps or plugs on any hydraulic lines, hydraulic fit- tings and components left open or exposed to prevent contamination.
4.Put labels on disconnected hydraulic lines and hoses for proper installation after repairs are completed.
5.Note the position of hydraulic fittings (especially el- bow fittings) on hydraulic components before removal. Mark parts if necessary to make sure they will be aligned properly when reinstalling hydraulic hoses and tubes.
After Repair or Replacement of Components
1.Check oil level in the hydraulic reservoir and add cor- rect oil if necessary. Drain and refill hydraulic system reservoir and change oil filter if component failure was severe or system is contaminated (see Flush Hydraulic System in this section).
2.Lubricate
3.Make sure all caps or plugs are removed from hy- draulic tubes, hydraulic fittings and components before reconnecting.
4.Use proper tightening methods when installing hy- draulic hoses and fittings (see Hydraulic Fitting Installa- tion in the General Information section of this chapter).
5.After repairs, check control linkages or cables for proper adjustment, binding or broken parts.
6.After disconnecting or replacing any hydraulic com- ponents, operate machine functions slowly until air is out of system (see Charge Hydraulic System in this sec- tion).
7.Check for hydraulic oil leaks. Shut off engine and cor- rect leaks if necessary. Check oil level in hydraulic reser- voir and add correct oil if necessary.
Hydraulic System
Check Hydraulic Lines and Hoses
WARNING
Keep body and hands away from pin hole leaks or nozzles that eject hydraulic fluid under high pressure. Use paper or cardboard, not hands, to search for leaks. Hydraulic fluid escaping under pressure can have sufficient force to penetrate the skin and cause serious injury. If fluid is in- jected into the skin, it must be surgically re- moved within a few hours by a doctor familiar with this type of injury. Gangrene may result from such an injury.
IMPORTANT: Check hydraulic lines and hoses daily for leaks, kinked lines, loose mounting supports, wear, loose fittings or deterioration. Make all neces- sary repairs before operating.
Groundsmaster | Page 4 | Hydraulic System |
