Charge Hydraulic System
NOTE: When initially starting the hydraulic system with new or rebuilt components such as motors, pumps or lift cylinders, it is important that the hydraulic system be charged properly. Air must be purged from the system and its components to reduce the chance of damage.
IMPORTANT: Change hydraulic oil filter whenever hydraulic components are repaired or replaced.
1.Park machine on a level surface. Lower cutting deck to the ground, stop engine and engage parking brake. Remove key from the ignition switch.
2.Make sure all hydraulic connections, lines and com- ponents are tight.
3.If component failure was severe or the system is con- taminated, flush and refill hydraulic system and reser- voir (see Flush Hydraulic System in this section).
4.Make sure hydraulic reservoir is full. Add correct hy- draulic oil if necessary.
5.Check control rod to the piston (traction) pump for proper adjustment, binding or broken parts.
6.Disconnect wire harness connector from engine run solenoid to prevent the engine from starting.
7.Make sure traction pedal and lift control lever are in the neutral position. Turn ignition key switch and engage starter for ten (10) seconds to prime the traction and gear pumps. Repeat this step again.
8.Connect wire harness connector to engine run sole- noid.
WARNING
Before jacking up the machine, review and follow Jacking Instructions in Chapter 1
9.Raise one front and one rear wheel off the ground and place support blocks under the frame. Chock re- maining wheels to prevent movement of the machine.
10.Make sure traction pedal and lift control lever are in neutral. Start engine and run it at low idle (1400 RPM). The charge pump should pick up oil and fill the hydraulic system. If there is no indication of fill in 30 seconds, stop the engine and determine the cause.
11.After the hydraulic system starts to show signs of fill, actuate lift control lever until the lift cylinder rod moves in and out several times. If the cylinder rod does not move after fifteen (15) seconds or the pump emits ab- normal sounds, shut the engine off immediately and de- termine cause or problem. Inspect for the following:
A.Loose filter or suction lines.
B.Blocked suction line.
C.Faulty charge relief valve.
D.Faulty gear pump.
12.If cylinder does move in 15 seconds, proceed to step 13.
13.Operate the traction pedal in the forward and reverse directions. The wheels off the ground should rotate in the proper direction.
A.If the wheels rotate in the wrong direction, stop engine and check for proper hose connections at traction pump and motors. Correct as needed.
B.If the wheels rotate in the proper direction, stop engine.
14.Adjust traction pedal to the neutral position.
15.Check operation of the traction interlock switch.
16.Remove blocks from frame and lower machine to the ground. Remove chocks from remaining wheels.
17.If the piston (traction) pump or a wheel or axle motor was replaced or rebuilt, run the machine so all wheels turn slowly for 10 minutes.
18.Operate machine by gradually increasing it’s work load to full over a 10 minute period.
19.Stop the machine. Check hydraulic reservoir and fill if necessary. Check hydraulic components for leaks and tighten any loose connections.
Hydraulic System
Groundsmaster | Page 4 | Hydraulic System |
