Diagnosing Cutting Performance Problems - Toro Groundsmaster 580-D Service Manual

Diagnosing Cutting Performance Problems

Over a period of time, the seals in the deck motors can
deteriorate and wear from heat and contamination. A
leaking motor seal will by--pass oil to the case drain line
and make the motor less efficient. Eventually enough oil
loss will occur and cause the deck motor to stall in heavy
cutting conditions. Continued operation with a motor in
an inefficient condition can generate so much heat that
the cartridge seals in the hydraulic manifold block can be
affected, compounding the problem.
If the deck motors slow during operation, use the follow-
ing procedure to analyze the problem:
1. Make sure deck drive area is clean, drive belt is at
Figure 15A
proper tension and belts are free of grease.
2. Check the hydraulic oil for water contamination and
replace as necessary (appears cloudy or milky).
3. Make sure deck drive hydraulic circuit working and re-
lief pressures are within specification.
4. Check PTO manifold block logic cartridges and relief
valves for burnt or hardened o--rings. Replace o--rings
as necessary.
5. Test deck motor for internal leakage (see Deck Motor
Internal Leakage Test on the next page).
Groundsmaster 580--D
Rev. F Testing
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