Service and Repairs
Check Hydraulic Lines and Hoses
WARNING
Keep body and hands away from pin hole leaks or nozzles that eject hydraulic fluid under high pres- sure. 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 removed within a few hours by a doctor familiar with this type of injury. Gangrene may result from such an injury.
Check hydraulic lines and hoses daily for leaks, kinked lines, loose mounting supports, wear, loose fittings, weather deterioration and chemical deterioration. Make all necessary repairs before operating.
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, and turn the en- gine off.
2.Make sure all hydraulic connections, lines, and components are secured tightly.
3.If component failure was severe or the system is contaminated, flush and refill hydraulic system and tank (see Flush Hydraulic System).
4.Make sure hydraulic tank is full. Add correct oil if necessary (see Check Hydraulic System Fluid).
5.Disconnect spark plug leads to prevent the engine from starting.
6.Check control linkage to the hydrostat for proper ad- justment, binding, or broken parts.
7.Make sure traction pedal and the lift control lever are in the neutral position. Turn ignition key switch; engage starter for fifteen (15) seconds to prime the traction and charge pumps.
8.Reconnect spark plug leads.
9.On the SP 2020/3020, pivot seat upward and re- move engine shield. On the SP 5020, remove cap screws that secure side panel to right side of machine.
10.Loosen lock nut on spring adjusting pin until bearing moves freely from cam. The pump shaft must be free to rotate during
WARNING
Before jacking up the machine, review and follow Jacking Instructions in Chapter 1 – Safety.
11.Raise one rear wheel off the floor, and place support blocks under frame. Chock remaining wheels to prevent movement of the machine.
12.Make sure traction pedal and lift control lever are in neutral. Start engine and run it at low idle of 1800 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.
2 |
3 |
1 |
Figure 21
1. Spring adjusting pin | 3. Cam |
2.Bearing
Hydraulic | Systems |
|
|
Sand Pro 2020/3020/5020 | Page 4 – 31 | Hydraulic System (Rev. A) |
