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HYDRAULIC LIFT OPERATION
SEQUENCE VALVE MANIFOLD, RELIEF VALVE
SETTING
To prevent damage to the lift linkage if there is a ‘hang-
up’ of a Lift Chain, a Relief Valve is installed in the
Manifold Block to control oil pressure to the Lift
Cylinders.
The Relief Valve setting prevents excessive oil pressure
at the Lift Cylinders at engine ‘idle speed’.
Higher ‘idle speeds’ will not increase the ‘lift rate’, this is
controlled by Restrictor Orifices in each cylinder.
Idle speed settings that are ‘too fast’ increase the oil flow
above the Relief Valve setting, negating its protection.
RELIEF VALVE SETTING
Fig.13
To set the ‘lift rate’ at normal engine ‘idle’ speed :
It is recommended that the adjustment is done when the
temperature is a minimum 50 deg.F. Operating at below
this temperature may require a slightly higher Relief
Valve opening pressure.
• Remove the Relief Valve Cap.
• Turn the Adjuster ‘IN’ ¼ turn at a time, until the
mower units lift at a normal rate.
• During adjustment oil should be heard passing
the Relief Valve, if it is not, the pressure is set
too high.
19
Fig.13