Removal (Fig. 53)
1.Park machine on a level surface, lower cutting deck, stop engine, apply parking brake and remove key from the ignition switch.
2.To prevent contamination of hydraulic system during removal, thoroughly clean exterior of pump assembly.
3.Remove traction rod from control arm on piston pump by removing lock nut, spacer and cap screw (Fig. 54).
4.Disconnect wire harness connector from neutral switch on piston pump.
5.Read the General Precautions for Removing and Installing Hydraulic System Components at the begin- ning of the Service and Repairs section of this chapter.
6.For installation purposes, label all hydraulic lines that connect to gear pump and piston pump.
7.Put a drain pan below the pump assembly. Remove hydraulic hoses and fittings connected to piston and gear pumps. Put plugs or caps on disconnected hydrau- lic hoses to prevent contamination of the system. Put plugs in open ports of pumps.
NOTE: If fuel tank is loosened and raised from the ma- chine, the gear pump and piston pump can be removed as a complete assembly.
8.Remove gear pump from machine (see Gear Pump Removal in this section).
9.Support the piston pump to prevent it from falling while removing two (2) cap screws and washers retain- ing pump assembly to engine flywheel plate. Carefully pull pump assembly from flywheel plate and raise it out of the machine.
Installation (Fig. 53)
1.Carefully lower piston pump into the machine, align pump input shaft to spring coupler on engine and posi- tion it to the engine flywheel plate. Support pump to pre- vent it from producing any side load into coupler and also to align pilot diameter of pump to flywheel plate bore.
2.While maintaining pump alignment with spring cou- pler and flywheel plate, install two (2) cap screws and washers to secure piston pump to engine flywheel plate. Torque screws from 79 to 84
3.Install gear pump to piston pump (see Gear Pump Installation).
4.Position traction rod to control arm on piston pump by installing cap screw, spacer and lock nut (Fig. 54).
5.Connect wire harness connector to neutral switch on traction pump.
6.Remove plugs or caps from disconnected hydraulic hoses and open ports of the pump assembly. Install fit- tings and hoses to correct location on gear and piston pumps.
7.Install new filter and fill hydraulic reservoir with cor- rect oil.
8.Disconnect engine run solenoid electrical connector to prevent engine from starting. Prime pumps by turning ignition key switch to crank engine for 10 seconds. Re- peat cranking procedure again.
9.Connect engine run solenoid electrical connector, start the engine and check for proper operation.
10.Properly fill hydraulic system (see Charge Hydraulic System in this section).
11.Stop engine and check for hydraulic oil leaks. Check hydraulic reservoir oil level.
5 | 4 | 3 | 1 |
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6 |
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7 |
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Figure 54
1. | Piston pump | 5. | Lock nut |
2. | Cap screw | 6. | Jam nut |
3. | Pump control arm | 7. | Traction rod |
4. | Spacer | 8. | Rod end |
Hydraulic System
Groundsmaster | Page 4 | Hydraulic System |
