Toro LT3340 Operator's Manual page 53

Problem
Excessive noise in hydraulic system
After initial satisfactory operation machine
loses power
Cylinder 'knocks' while rotating
One cylinder rotates slowly
Cutterhead fails to lift out of work
Cutterheads do not follow ground contours
Possible Cause
1. Faulty pump
2. Faulty motor
3. Air leaking into system
4. Suction strainer blocked or damaged
5. Excessive oil viscosity due to cold
conditions
6. Low relief valve setting
7. Low hydraulic oil level
1. Worn pump or motor
2. Low hydraulic oil level
3. Incorrect oil viscosity
4. Oil filter element blocked
5. Faulty pressure relief valve
6. Overheating
7. Leaks on suction hose
1. High spot on cylinder or bottom blade
due to contact with foreign object
2. Worn cylinder bearings
1. Cutting cylinder bearing seized
2. Incorrect rotation motor fitted
3. Motor integral check valve jammed
open
4. Cutting cylinder tight on the bottom
blade
5. Motor worn
1. Lift cylinder seal failure
2. Pressure relief valve jammed open or
wrongly set
3. Defective control valve
4. Mechanical blockage
1. Incorrect hose routing or incorrect
orientation of hydraulic fittings
2. Tightness in pivots
3. Mower operated in 'hold' position
4. Weight transfer set too high
53
Corrective Action
1. Identify noisy pump and service or
replace
2. Identify noisy motor and service or
replace
3. Tighten or replace hydraulic fittings
particularly in suction lines
4. Clean and replace suction strainer or
renew as necessary
5. Allow system to warm up
6. Have relief valve pressure checked.
Consult your authorized dealer
7. Fill hydraulic oil reservoir to correct
level
1. Replace as necessary
2. Fill hydraulic oil tank to correct level
3. Renew oil in hydraulic tank with
correct viscosity grade oil, refer to
SPECIFICATIONS
4. Change filter element
5. Have relief valve cleaned and pressure
checked. Consult your authorised
dealer
6. Check cylinder to bottom blade
adjustment. Reduce work rate i.e.
increase height of cut or reduce forward
speed
7. Check and tighten fittings. Replace
hose if necessary.
1. Remove high spot with a stone and
back lap to restore cutting edges.
Serious damage will require re grinding
2. Replace as necessary
1. Replace as necessary
2. Check motor and replace if necessary
3. Have check valve cleaned and checked
4. Re adjust setting
5. Replace motor
1. Replace seals
2. Have relief valve pressure checked.
Consult your authorized dealer
3. Overhaul control valve
4. Remove blockage
1. Move cutterheads throughout extremes
of movement and observe any
tightness in the hoses. Correctly
route hoses and orientate fittings as
necessary
2. Release and grease as necessary
3. Move position control switch to 'down
/ float' position
4. Reduce weight transfer