Deck Motor Internal Leakage Test; Alternate Deck Motor Test - Toro Groundsmaster 580-D Service Manual

Deck Motor Internal Leakage Test

NOTE: Test only one deck at a time. Decks not being
tested should be in the raised position so the deck will
not operate when the PTO is engaged.
1. Determine which deck motor is turning slow. The left
and right decks are powered in series by the same cir-
cuit, therefore one deck could affect the other.
2. To prevent deck blades from rotating, remove one
outer blade from the deck to be tested and install a long-
er blade (P/N 29--5530) from a Groundsmaster 72 inch
deck. Put the front cutting edge of the longer blade
against the deck housing (Fig. 15B).
Make sure other two decks not being tested
are in the raised position. Blades on the other
decks will rotate if in the lowered position
when PTO switch is engaged. To prevent seri-
ous personal injury or death, keep clear of ro-
tating blades. Other blades on deck being
tested will rotate if belt on spindle with longer
blade breaks or slips.
3. Remove the case drain line (smallest of the three
lines) from the deck motor (Fig. 15C).
4. Connect a flow meter in line with the case drain (oil
flow will be away from the motor).
5. With the other decks in the raised position, start the
engine and engage the PTO. Move the throttle to full
speed position and note the oil flow exiting the motor
through the case drain line. If the flow exceeds 1.5 GPM,
the deck motor should be repaired or replaced.
NOTE: If one motor shows excessive case drain flow,
other motors may also be in a similar condition. Failure
to test all three motors may lead to repeat failures.

Alternate Deck Motor Test

(If a flow meter is not available)
1. Do steps 1 -- 3 as described above, except disconnect
the case drain line from the bulkhead instead of the mo-
tor. Put a cap on the bulkhead fitting.
2. Put the case drain line from the motor into a 5 gallon
container and secure the line in place.
Testing
DANGER
3. Start the engine and engage the PTO for exactly 15
seconds at full throttle, then disengage the PTO and
stop the engine.
4. Measure the amount of oil in the container. Multiply
the amount collected by 4 to get the gallons per minute
flow discharged from the case drain line. If the flow ex-
ceeds 1.5 GPM, the deck motor should be repaired or
replaced.
NOTE: If one motor shows excessive case drain flow,
other motors may also be in a similar condition. Failure
to test all three motors may lead to repeat failures.
2
1. Deck motor
Rev. F
Page 4 - -
28.4
LONGER BLADE
(Front edge against
deck housing)
Figure 15B
1
Figure 15C
2. Case drain line
Groundsmaster 580--D