Toro 10178SL Service Manual Groundsmaster 4300 D Preface Publication

Mow Circuit
A four section gear pump is coupled to the piston (trac-
tion) pump. Gear pump sections (P1) and (P2)  supply
hydraulic flow for  the mow circuit. These gear  pumps
take their suction from the hydraulic reservoir.
amanifold sensing line. This flow passes through anori-
fice which causes a pressure differential that shifts logic
cartridge LC1. The shifted LC1 allows circuit flow to ro-
tate the rear  cutting deck motors.  Return oil from the
deck motors is  directed through the  shifted logic car-
tridge (LC1), manifold port T, oil cooler, oil filter and then
to the reservoir. Deck motor case drain leakage returns
directly to the hydraulic reservoir.
The deck control manifold contains two (2) independent
control circuits for the front and rear cutting decks. Each
circuit is supplied by its own pump section. Pump sec-
tion (P1)  supplies hydraulic power  to the rear  cutting
decks with  circuit control  by  proportional relief  valve
(PRV1), relief valve (RV1) and logic cartridge (LC1) in
the deck control manifold. Pump section (P2) supplies
thefrontcuttingdeckswithcircuitcontrolbyproportional
reliefvalve(PRV2),reliefvalve(RV2)andlogiccartridge
(LC2) in the deck control manifold. Both circuits share
manifoldportT,whichdrainstotheoilcooler,oilfilterand
hydraulic reservoir.
Mow circuit pressure for the  rear cutting decks (pump
section P1) can be measured at deck control manifold
port G1.
The front cutting deck circuit operates the same as the
rear cutting deck circuit. Deck control manifold propor-
tional relief  (PRV2), relief  valve (RV2) and  logic car-
tridge (LC2) are used  to control the front cutting deck
circuit. Mow circuit pressure for the front cutting decks
(pump section  P2) can  be measured at  deck control
manifold port G2.
Cutting deck motors are equipped with a cross over re-
lief valve  to prevent hydraulic  component damage  in
case a single cutting deck should stall.
Cutting Deck Circuit Relief
The machine controller  uses inputs from  various ma-
chine switches to determine when the solenoids for pro-
portional relief  valves (PRV1)  and  (PRV2) are  to be
energized. The controller also provides a slight delay in
activation of rear cutting decks.
Maximum cutting deck circuit pressure is limited by the
proportional relief valves in the hydraulic  control man-
ifold. The front deck circuit valve (PRV2) is set at 3500
PSI (241 bar) and the rear deck circuit valve (PRV1) is
set at 2500 PSI (175 bar).
PTO Not Engaged
When increased circuit resistance is met (e.g. a cutting
blade should strike an object), the pressure increase is
felt at  the proportional  relief valve. If  circuit pressure
shouldexceed the reliefsetting, thevalve willopen toal-
low circuit flow to return to tank through manifold port T.
When circuit pressure lowers, the valve closes to allow
flow to return to the deck motors.
When proportional relief valves (PRV1) and (PRV2) are
notenergized (PTOswitch in theOFF position orcutting
decks raised), flow from pump sections (P1) and (P2) is
directedthroughtheunshiftedproportional   reliefvalves,
out the mow control manifold port T and then returns to
thehydraulicreservoirthroughtheoilfilterandoilcooler,
bypassing  the deck  motors. The  manifold  logic car-
tridges (LC1 and LC2) remain in the unshifted position
to prevent any return flow from the deck motors so the
motors will not rotate.
#4
#1
#5
PTO Engaged (Fig. 11)
GROUNDSMASTER
4300--D CUTTING
DECK LOCATIONS
When proportional relief valve (PRV1) is energized by
the controller (PTOswitch in theON position andcutting
decks lowered), the proportional relief valve shifts and
prevents  pump section  (P1)  flow through  the  valve.
Pump flow that entered deck control manifold port P1 is
then directed toward the rear cutting deck motors. Be-
cause logic cartridge LC1 is unshifted, circuit pressure
increases until manifold relief valve (RV1) is opened by
a manifold pilot piston. The shifted relief valve allows a
small amount of hydraulic flow to return to tank through
#
2
#3
Figure 12
Groundsmaster 4300--D
Page 4 -- 13
Hydraulic System
Product Specification
CategoriesLawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals
Tags
Download File
Please Enter the Security Characters Shown Below. Letters are Case Sensitive. Your download link will appear upon completing this step.
- 255 pages
Document TypeCatalog
LanguageEnglish
Product BrandToro. Customer Service Representatives are available by phone: Monday - Friday 7:30 a.m. to 9:00 p.m. (CDT) - Saturday 8:00 a.m. to 8:00 p.m. (CDT) - Sunday 10:00 a.m. to 8:00 p.m. (CDT)
Canada 1-888-225-4886 USA 1-888-384-9939, Lawn Mower
Document File TypePDF
Publishertoro.com
Wikipedia's PageToro Company
CopyrightAttribution Non-commercial
(0 votes, average: 0 out of 5)

Submit your review (optional)
(will not be displayed)
* Required Field

Leave a Reply

Your email address will not be published. Required fields are marked *

*
*
Website