Toro 4100-D service manual Procedure for Cutting Deck Motor Case Drain Leakage Test

Procedure for Cutting Deck Motor Case Drain Leakage Test

NOTE: Over a period of time, a deck motor can wear in- ternally. A worn motor may by--pass oil to its case drain causing the motor to be less efficient. Eventually, enough oil loss will cause the deck motor to stall under heavy cutting conditions. Continued operation with a worn, inefficient motor can generate excessive heat, cause damage to seals and other components in the hy- draulic system and affect quality of cut.

NOTE: One method to find a failing or malfunctioning deck motor is to have another person observe the ma- chine while mowing in dense turf. A bad deck motor will run slower, produce fewer clippings and may cause a different appearance on the turf.

1.Make sure hydraulic oil is at normal operating tem- perature by operating the machine for approximately 10 minutes. Make sure the hydraulic tank is full.

2.Park machine on a level surface with the cutting deck lowered and off. Make sure engine is off and the parking brake is engaged.

CAUTION

Prevent personal injury and/or damage to equip- ment. Read all WARNINGS, CAUTIONS and Pre- cautions for Hydraulic Testing at the beginning of this section.

NOTE: The wing deck motors are connected in series. To isolate a faulty motor, both motors in the circuit may have to be tested by starting with the left side motor first.

3.Disconnect return hose from the motor to be tested (Fig. 37). Install flow tester in series with the motor and the disconnected return hose. Make sure the flow con- trol valve on tester is fully open.

4.Disconnect the motor case drain hose (small diame- ter hose) where it connects to the machine (not at the motor). Put a steel cap on the fitting; leave the case drain hose open (Fig. 38).

5.After installing flow tester, start engine and run at idle speed. Check for hydraulic leakage and correct before proceeding with test.

6.Sit on seat and operate the engine at full speed (2870 RPM). Move PTO switch to ON.

7.While watching pressure gauge, slowly close flow control valve on tester until a pressure of 1200 PSI (83 bar) is obtained.

NOTE: Use a graduated container, special tool TOR4077, to measure case drain leakage (Fig. 38).

8.Have another person measure flow from the case drain line for 15 seconds, then move the PTO switch to OFF. Open the tester flow control valve and stop the en- gine. Record test results.

TEST RESULTS: Flow less than 22.2 ounces (662 ml).

9.If flow is more than 22.2 ounces (662 ml), the motor is worn or damaged and should be repaired or replaced.

10.After testing is completed, disconnect tester from motor and hose. Reconnect hose to the deck motor. Re- move cap from machine fitting and reconnect case drain hose.

11.If required, repeat test procedure for other deck mo- tors.

1 3

2

Figure 37

1.	Deck motor (RH shown)	3. Case drain hose
2.	Return hose

Hydraulic System

CAUTION
Cutting deck blades will rotate with PTO switch
in ON position. Keep away from cutting deck dur-
ing test to prevent personal injury from rotating
blades. Do not stand in front of the machine.	Figure 38

Groundsmaster 4100--D Page 4 -- 49 Rev. A Hydraulic System