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1. Toro Groundsmaster 325d Parts Diagram
2. Toro Groundsmaster 325d Owners Manual

This PDF service manual will show you every nut and bolt on your vehicle. With hundreds of pages, it will show you how to distinguish any problem (from an oil change to a transmission swap) and how to fix it on your own. There are many illustrations to aid you during your job and easy to read text throughout the manual. You will be able to use the search function to browse the manual and print out your needed pages.

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TORO GM 345 / 325-D Hydraulics 39 Hydrostatic Drive and Hydraulic Systems The drive system on the Groundsmaster ® 300 series consists of a Sunstrand ® Series 15, inline hydrostatic pump and motor assembly. This assemble is connected to a Dana ® GT-20axle/differential assembly. Engine power is transmitted from the engine to the input shaft of the hydrostatic unit. The output of the hydrostatic unit transmits the power to the pinion shaft, through the differential and to the wheels. The units brakes are fastened to the outer end of the axle. Hydrostatic Transmission Operation Charge Circuit The charge circuit supplies oil to the hydrostatic circuit and replenishes the oil normally lost through internal leakage and transmission cooling. Oil from the reservoir is drawn through the oil filter to the charge pump.

From the charge pump, the oil is exposed to the charge relief valve which maintains a charge pressure of 70 to 150 psi. The oil then flows to the charge check valves. The check valve that is in the low pressure, (non-driving)side opens and allows oil to flow to the drive loop. TORO GM 345 / 325-D Hydraulics 41 Drive Circuit The drive circuit consists of a variable displacement pump and the hydrostatic motor. Drive circuit operation.

When the traction pedal is depressed the swash plate in the pump rotates and the pump begins to pump. The oil from the pump flows to the hydrostatic motor. The oil flows through the hydrostatic motor and returns to the pump. (The oil flows in a closed loop).

There is a bypass valve located in the drive circuit. When the unit is pushed with the engine off, this valve allows the oil being forced out of the hydrostatic motor to be directed back to the motor, instead of being forced through the pump. Note: Use the bypass valve to move the unit a short distance only, excessive travel can damage the internal components of the hydrostatic transmission. TORO GM 345 / 325-D Hydraulics 43 Acceleration valves 1.

The drive oil from the hydrostatic pump also flows to the acceleration valves. The oil is allowed to flow through the orifice in the valve, until sufficient pressure is created to close the acceleration valve. Bleeding away some of this initial oil flow allows for a smoother unit start and direction change.

The acceleration valves do not serve as the drive circuit relief valve. The 2 wheel drive unit does not have a relief valve. Relief Valve The 4 wheel drive unit has an externally mounted relief valve.

The relief valve only regulates the oil pressure in the forward direction. TORO GM 345 / 325-D Hydraulics 45 Troubleshooting To test the hydrostatic system there are several test ports on the hydrostatic unit.

Charge pressure test port, (located on the left side rear of the hydrostatic unit, next to the steering and lift supply line). Forward and reverse drive pressure test ports, (located in the middle section of the hydrostatic unit). ∙ Forward drive is the RH test port. ∙ Reverse drive is the LH test port. ∙ There is also test ports located on the underside of the hydrostatic unit.

(Use these test ports for 4WD units). Testing charge pressure. ∙ Remove the test port plug using a 3/16” allen wrench. ∙ Connect 1000 psi gauge using a 1/8 NPT adapter screwed into the pump.

∙ Operate engine at 3200 RPM. ∙ Charge pressure should read 70 - 150 psi. Low charge pressure 1. Possible causes: ∙ Plugged hydraulic filter. ∙ Low engine RPM. ∙ Defective charge relief valve.

Toro Groundsmaster 325d Parts Diagram

∙ Defective implement relief valve. ∙ Worn charge pump.

∙ Worn drive pump. ∙ Worn drive motor. Performance results: ∙ Noisy operation. (Drive circuit not kept full) ∙ Poor hill performance. (Slows or stops on hills) ∙ System over heating. (low oil cooler flow) ∙ Complete drive failure.(unit stops moving) ∙ Pump or motor failure. TORO GM 345 / 325-D Hydraulics 47 1.

Testing drive pressure. ∙ Remove the test port plug using a 3/16” allen wrench. ∙ Connect 10,000 psi gauge into the test port using a 3/8 - 24 adapter. ∙ Chain machine and lock brakes. ∙ Operate engine at 3200 RPM. ∙ 2WD, drive pressure should read 4000-4500psi. (DO NOT exceed 5000 psi) ∙ 4WD, drive pressure should read 5200 psi.

Low drive pressure. (Charge pressure “OK”) 2. Possible causes. ∙ Leaking check valves.

∙ Leaking acceleration valves. ∙ Leaking bypass valve. (tow valve) ∙ Worn drive pump. ∙ Worn drive motor. Performance results. ∙ Noisy operation.

(Oil leaking past check valves or acceleration valves) ∙ Poor hill climbing performance. (Slows or stops on hills) ∙ Complete drive failure.(Unit stops moving) Relief Valve The 4 wheel drive unit has an externally mounted relief valve. To check the relief valve setting, the test gauge must be connected to the forward test port on the bottom of the hydrostatic pump.

Toro Groundsmaster 325d Owners Manual

Than test the pressure as usual. The relief valve is set to limit the drive pressure to 5200 PSI.