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Hydraulic Flow Diagrams Groundsmaster 4100--D Traction Circuit (4WD Forward Shown) Working Pressure Low Pressure (Charge) Return or Suction Flow CENTER DECK MANIFOLD M1 RV1 P1 RV2 LC1 S M2 LC2 P2 LH WING DECK MANIFOLD M1 RV1 P1 RV2 LC1 S M2 LC2 P2 OR RH WING DECK MANIFOLD M1 RV1 P1 RV2 LC1 S M2 LC2 P2 OR M1 M2 ST L P1 T P2 FAN DRIVE MANIFOLD 4WD MANIFOLD COUNTERBALANCE MANIFOLD Hydraulic System Page 4 - 10 Groundsmaster 4100--D
Traction Circuit: 4WD (Mow) The traction circuit piston pump is a variable displacement pump that is directly coupled to the engine flywheel. Pushing the traction pedal engages a hydraulic servo valve which controls the variable displacement piston pump swash plate to create a flow of oil. This oil is directed to the front wheel and rear axle motors. Operating pressure on the high pressure side of the closed traction circuit loop is determined by the amount of load developed at the fixed displacement wheel and axle motors. As the load increases, circuit pressure can increase to relief valve settings: 4000 PSI (274 bar) in forward and 5000 PSI (343 bar) in reverse. If pressure exceeds the relief setting, oil flows through the relief valve to the low pressure side of the closed loop traction circuit. The traction circuit provides operation in either 4WD (mow) or transport (2WD). Traction circuit pressure (forward and reverse) can be measured at test ports on the sides of the machine. The traction circuit pump and motors use a small amount of hydraulic fluid for internal lubrication. Fluid is designed to leak across traction pump and motor components into the case drain. This leakage results in the loss of hydraulic fluid from the closed loop traction circuit that must be replaced. The charge circuit is designed to replace this traction circuit leakage. The gear pump section that supplies oil to the steering and lift/lower circuits also provides oil for the charge circuit. This gear pump is driven directly off the traction pump. It provides a constant supply of charge oil to make up for oil that is lost due to internal leakage in the traction pump and motors. Pump flow for the charge circuit is directed through the oil filter and to the low pressure side of the closed loop traction circuit. A filter bypass valve allows charge oil flow to the closed loop if the filter becomes plugged. Charge pressure is limited to 250 PSI (17 bar) by a relief valve located in the oil filter manifold. Charge pressure can be measured at the charge circuit pressure test port on the oil filter manifold. Forward Direction When the transport/4WD switch is in the 4WD (mow) position and the traction pedal is pushed in the forward direction, oil from the piston pump is directed to the front wheel motors and 4WD manifold. Oil flow to the front wheel motors drives the motors in the forward direction and then returns to the hydrostat. Oil flow to the 4WD manifold enters the P1 port and then is directed to the PD1 cartridge and out of the manifold M1 port to drive the rear axle motor in the forward direction. Oil returning from the rear motor re--enters the 4WD manifold at the M2 port. Flow passes through the PD2 cartridge, through the CV check valve, out manifold port P2 and back to the hydrostat. When going down a hill, the tractor becomes an over-- running load that drives the wheel and axle motors. In this condition, the rear axle motor could lock up as the oil pumped from the motor increases pressure as it returns to the hydrostat. To prevent rear wheel lock up, an adjustable relief valve (RV) in the 4WD manifold reduces rear axle motor pressure created in down hill, dynamic braking conditions. Reverse Direction The traction circuit operates essentially the same in reverse 4WD (mow) as it does in the forward direction. However, the flow through the circuit is reversed. Oil flow from the hydrostat is directed to the front wheel motors and also to the 4WD manifold. The oil to the front wheel motors drives them in the reverse direction and then returns to the hydrostat. The oil to the 4WD manifold enters the manifold at port P2 and flows through pressure reducing valve (PR) which limits the down stream pressure to the rear axle motor to 650 PSI (45 bar) so the rear wheels will not scuff the turf during reverse operation. This reduced pressure flows through the PD2 cartridge and out port M2 to the rear axle motor. Return oil from the rear motor re--enters the 4WD manifold at port M1, flows through the PD1 cartridge, exits the manifold at port P1 and returns to the hydrostat. Hydraulic System Groundsmaster 4100--D Page 4 - 11 Hydraulic System
Page 1 and 2: Part No. 08162SL (Rev. A) Service M
Page 3 and 4: Table Of Contents Chapter 1 - Safet
Page 5 and 6: Table of Contents GENERAL SAFETY IN
Page 7 and 8: Maintenance and Service 1. Before s
Page 9 and 10: Safety and Instruction Decals Numer
Page 11 and 12: Chapter 2 Table of Contents Product
Page 13 and 14: Torque Specifications Recommended f
Page 15 and 16: Standard Torque for Dry, Zinc Plate
Page 17 and 18: Chapter 3 Kubota Diesel Engine Tabl
Page 19 and 20: Specifications Item Make / Designat
Page 21 and 22: Removal (Fig. 1) 1. Park machine on
Page 23 and 24: Removal (Fig. 5) CAUTION B The muff
Page 25 and 26: DANGER Because diesel fuel is highl
Page 27 and 28: Removal (Fig. 8) 1. Park machine on
Page 29 and 30: Engine Removal (Fig. 9) 1. Park mac
Page 31 and 32: 3. Slowly lower engine into the mac
Page 33 and 34: Coupler Removal (Fig. 16) NOTE: The
Page 35 and 36: Chapter 4 Hydraulic System Table of
Page 37 and 38: General Information Operator’s Ma
Page 39 and 40: Hydraulic Hose and Tube Installatio
Page 41 and 42: Adjustable Fitting (Fig. 8) 1. Make
Page 43: Hydraulic System This page is inten
Page 47 and 48: Traction Circuit: Transport (2WD) T
Page 49 and 50: Lower Cutting Deck A four section g
Page 51 and 52: Raise Cutting Deck A four section g
Page 53 and 54: Mow Circuit Hydraulic flow for the
Page 55 and 56: Hydraulic System This page is inten
Page 57 and 58: Steering Circuit A four section gea
Page 59 and 60: Engine Cooling Fan Circuit A four s
Page 61 and 62: Hydraulic Test Fitting Kit This kit
Page 63 and 64: Problem Traction power is lost or u
Page 65 and 66: Testing The most effective method f
Page 67 and 68: Procedure for Traction Circuit Char
Page 69 and 70: Procedure for Traction Circuit Reli
Page 71 and 72: Procedure for Counterbalance Pressu
Page 73 and 74: Procedure for Rear Traction Circuit
Page 75 and 76: Procedure for Traction Circuit Redu
Page 77 and 78: Procedure for Cutting Deck Circuit
Page 79 and 80: Procedure for Cutting Deck Manifold
Page 81 and 82: Procedure for Cutting Deck Gear Pum
Page 83 and 84: Procedure for Cutting Deck Motor Ca
Page 85 and 86: Procedure for Steering Circuit Reli
Page 87 and 88: Procedure for Lift/Lower Circuit Re
Page 89 and 90: Procedure for Steering and Lift/Low
Page 91 and 92: Procedure for Engine Cooling Fan Ci
Page 93 and 94: Procedure for Engine Cooling Fan Ci
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Service and Repairs General Precaut
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Charge Hydraulic System NOTE: When
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NOTE: The front frame needs to be l
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Removal (Fig. 48) CAUTION The radia
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Removal (Fig 49) 1. Park machine on
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IMPORTANT: Use caution when clampin
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Hydraulic System This page is inten
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Removal (Fig. 53) 1. Park machine o
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Removal (Fig. 59) NOTE: The ports o
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4WD Manifold Service (Fig. 60) 1. M
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Removal (Fig. 61) 1. Read the Gener
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Filter Manifold Service (Fig. 62) F
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CAUTION The centering springs are u
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Disassembly (Fig. 68) 1. Pump oil o
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8. Remove and discard back--up gask
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Fan Drive Manifold Service (Fig. 76
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Cutting Deck Motor Removal 1. Park
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IMPORTANT: Mark the relative positi
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Removal (Fig. 85) NOTE: The ports o
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PTO Manifold Service (Fig. 86) For
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Disassembly (Fig. 89) 1. Plug all p
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Disassembly (Figs. 92 and 93) 1. Re
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Chapter 5 Electrical System Table o
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Special Tools Order special tools f
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Troubleshooting CAUTION Remove all
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Cutting Deck Operating Problems The
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Adjustments Wing Deck Position Swit
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Component Testing For accurate resi
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Warning Lights Engine Oil Pressure
Page 185 and 186:
Transport / 4WD Switch The transpor
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Seat Switch The seat switch is norm
Page 189 and 190:
Hour Meter The hour meter is locate
Page 191 and 192:
Start, Engine Shutdown, Seat, Alarm
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TEC -5002 Controller Groundsmaster
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Fuel Gauge The fuel gauge can be te
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Glow Controller The glow controller
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Dual Temperature Switch The dual te
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Traction Neutral Switch The tractio
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Fusible Links The Groundsmaster 410
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Cutting Deck Raise and Lower Switch
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Service and Repairs NOTE: For engin
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2. Conduct a hydrometer test of the
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Chapter 6 Axles, Planetaries and Br
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General Information Operator’s Ma
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3. Chock rear wheels and jack up fr
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This page is intentionally blank. A
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Removal (Fig. 6) 1. Park machine on
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NOTE: The planetary wheel drive ass
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This page is intentionally blank. A
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8. Remove cap screw and flange nut
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Bevel Gear Case and Axle Case The f
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Bevel Gear Case and Axle Case Insta
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9. Remove the bevel gear case/axle
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Axle Shafts The following procedure
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7. Secure the lock nut with the sta
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Differential Gear Inspection 1. Mea
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Pinion Gear to Ring Gear Engagement
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Chapter 7 Chassis Table of Contents
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Disassembly (Fig. 1) 1. Park machin
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CAUTION When changing attachments,
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Removal (Fig. 5) 1. Park machine on
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Disassembly (Fig. 8) 1. Disassemble
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NOTE: Most of the seat suspension c
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Removal 1. Park machine on a level
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Chapter 8 Cutting Deck Table of Con
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General Information CAUTION Never i
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This page is intentionally blank. C
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Removal (Fig. 1) 1. Position machin
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Removal (Fig. 6) 1. Position machin
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Cutting Deck Link Service Disassemb
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Installation (Fig. 13) 1. Position
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2. Install outer bearing spacer int
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Disassembly (Fig. 22) 1. Park machi
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Chapter 9 Foldout Drawings Table of
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CENTER DECK MANIFOLD COUNTERBALANCE
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CONTINUES FROM SHEET 1 CONTINUES FR
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CONTINUES TO SHEET 2 CONTINUES TO S
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CONTINUES TO SHEET 2 WHEN THE PTO S
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CONTINUES TO SHEET 2 CONTINUES TO S
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YELLOW GRAY YELLOW/BLACK VIOLET WHI
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FLOW DIVIDER SOLENOID Groundsmaster
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(STARTER) (STARTER) (STARTER) Groun
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BLUE GRAY VIOLET BLACK YELLOW GRAY
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caution - Toro

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