Toro ProCore, Service Manual

Page: 41 / 122

ProCore Processor Hydraulic System Page 4 -- 13
Tow Hitch Circuits (When Equipped With the Tow Hitch Kit)
Raise and Lower (Fig. 13)
When the remote control handle lift/offset switch is in the
lift position, all four (4) of the solenoid valves in the tow
hitch manifold are de--energized. In this position, hy-
draulic oil flow from the tow vehicle is available for the
ProCore Processor raise and lower circuits via solenoid
valves S1 and S2. Hydraulic flow to the tow hitch offset
cylinder is blocked by solenoid valves S3 and S4. See
Raise and Lower Circuit Operation in this section for
raise and lower circuit information.
Hitch Offset (Fig. 14)
When the remote control handle lift/offset switch is in the
offset position, all four (4) of the solenoid valves in the
tow hitch manifold are energized. In this position, hy-
draulic oil flow from the tow vehicle is available for the
ProCore Processor hitch offset function via solenoid
valves S3 and S4. Hydraulic flow to the lift cylinder is
blocked by solenoid valves S1 and S2. A fixed orifice in
the hydraulic fitting at tow hitch manifold port C4 controls
the offset speed by providing a restriction for the flow to
or from the offset cylinder. Maximum hitch offset circuit
pressure is limited by the pressure relief valve of the tow
vehicle.
Figure 14
TOW HITCH
MANIFOLD
OFFSET
CYLINDER
LIFT RELIEF
MANIFOLD
TO
PORT B
LIFT RELIEF
MANIFOLD
TO
PORT A
(EXTENDING)
Working Pressure
Return
Flow
Tow Hitch Circuits
Remote Control Switch in Offset Position
Tow Vehicle Control in Raise Position
All manifold
energized
solenoids are
NOTE: For identification purposes, the hydraulic hose
to lift relief manifold port A is equipped with a cable tie
at the Core Processor quick coupler.
Hydraulic System