Steering Circuit (5610-D) - Toro Reelmaster 5410 Series Service Manual

Steering Circuit (5610-D)

Left Turn
Right Turn
Hydraulic System: Hydraulic Flow Diagrams (5610-D)
A 4-section gear pump is coupled to the piston (traction) pump. The gear pump
section P3 supplies hydraulic flow to the steering control valve and for the
traction charge circuit. The steering control valve receives the pump supply first,
ensuring pressure and volume is always available for steering control, no matter
the charge circuit demand. The gear pump takes its suction from the hydraulic
reservoir. The steering circuit pressure is limited to 6,990 to 7,500 kPa (1,015 to
1,088 psi) by a relief valve (R10) located in the steering control valve.
With the steering wheel in the neutral position
running, the hydraulic flow enters the steering control valve at the P port and
goes through the steering control spool valve, bypassing the rotary meter (V1)
and steering cylinder. The flow leaves the control valve through the T port to the
transmission oil filter and traction charge circuit.
When a left turn (Figure
steering wheel, positions the steering control spool valve so that the flow is
directed through the bottom of the spool. The flow entering the steering control
valve at the P port goes through the spool and is routed to 2 places. First, most
of the flow through the valve is bypassed out the T port back to the transmission
oil filter and traction charge circuit. Second, the remainder of the flow is directed
through the rotary meter (V1) and out through the L port. The pressure retracts
the steering cylinder piston for a left turn. The rotary meter ensures that the
fluid flow to the steering cylinder is proportional to the amount of turning on the
steering wheel. The fluid leaving the steering cylinder flows back through the
steering control spool valve and then out of the steering control valve through
the T port.
The steering control valve returns to the neutral position when turning is
completed.
When a right turn (Figure
steering wheel, positions the steering control spool valve so that the flow is
directed through the top of the spool. The flow entering the steering control valve
at the P port goes through the spool and is routed to 2 places. As in a left turn,
most of the flow through the valve is bypassed out through the T port back to
the transmission oil filter and traction charge circuit. Also like a left turn, the
remainder of the flow is directed through rotary meter (V1) but goes out through
port R. The pressure extends the steering cylinder piston for a right turn. The
rotary meter ensures that the fluid flow to the steering cylinder is proportional to
the amount of the turning on the steering wheel. The fluid leaving the steering
cylinder flows back through the steering control spool valve then through the
T port and to the hydraulic reservoir.
The steering control valve returns to the neutral position when turning is
completed.
76) is made with the engine running, the turning of the
76) is made with the engine running, the turning of the
Page 6–42
(Figure 76) and the engine
Reelmaster ® 5410/5510/5610 Series
15216SL Rev C