Ventrac 4520Z - Page 7

Removing and Installing the Fuel Tank......................................................................... 4–11
Removing the Fuel Pump ................................................................................................ 4–13
Installing the Fuel Pump................................................................................................... 4–14
Engine Cooling System ................................................................................................ 4–15
4520Z Removing the Radiator........................................................................................ 4–16
4520Z Installing the Radiator .......................................................................................... 4–17
Engine............................................................................................................................... 4–17
Chapter 5: Hydraulic System ................................................................................................ 5–1
General Information............................................................................................................. 5–2
4520 Operator’s Manual and Accessory Installation Instructions ........................ 5–2
Towing the 4520 ............................................................................................................... 5–2
Relieving Pressure from the Hydraulic System ........................................................ 5–2
Remote Filtering the Hydraulic System ...................................................................... 5–3
Testing the Static Implement Pressure ....................................................................... 5–5
Testing the Hydrostatic Drive System Under Load .................................................. 5–5
Testing the Steering Valve P-Port Bypass ................................................................. 5–6
Adjusting the Hydraulic Pump Tow Valve................................................................... 5–7
Hydraulic Hoses ................................................................................................................... 5–9
Installing the Hydraulic Hoses and Tubes (O-Ring Face Seal)........................... 5–10
Installing the Hydraulic Fittings (SAE Straight Thread O-Ring Fittings)............ 5–12
Hydraulic Schematic ......................................................................................................... 5–16
Hydraulic Flow Diagrams ................................................................................................. 5–17
Drive Circuit..................................................................................................................... 5–17
Implement Circuit ........................................................................................................... 5–18
Service and Repairs .......................................................................................................... 5–19
General Precautions for Removing and Installing Hydraulic System
Components.................................................................................................................... 5–19
Removing the Front Hydraulic Motor ........................................................................ 5–21
Installing the Front Hydraulic Motor........................................................................... 5–22
Removing the Rear Hydraulic Motor ......................................................................... 5–22
Installing the Rear Hydraulic Motor............................................................................ 5–23
Removing the Hydraulic Pump ................................................................................... 5–24
Installing the Hydraulic Pump ..................................................................................... 5–26
Removing the SDLA Spool Valve............................................................................... 5–27
Installing the SDLA Spool Valve ................................................................................. 5–27
Replacing the SDLA Spool Valve Float Detent....................................................... 5–28
Removing and Installing the Hydraulic Cooler Fan................................................ 5–29
Removing and Installing the Steering Valve............................................................ 5–30
Removing the Steering Cylinder................................................................................. 5–32
Installing the Steering Cylinder................................................................................... 5–33
Removing the Lift Cylinder........................................................................................... 5–33
Installing the Lift Cylinder ............................................................................................. 5–34
Removing the 3–Point Hitch Spool Valve................................................................. 5–35
Installing the 3–Point Hitch Spool Valve ................................................................... 5–35
Removing the 3–Point Hitch Lift Cylinder................................................................. 5–36
Installing the 3–Point Hitch Lift Cylinder ................................................................... 5–37
Removing and Installing the Hydraulic Fluid Reservoir ........................................ 5–38
Chapter 6: Electrical System................................................................................................. 6–1
General Information............................................................................................................. 6–3
4520 Operator’s Manual and Accessory Installation Instructions ........................ 6–3
Kubota Engine Electrical Components ....................................................................... 6–3
Amperage Draw Chart .................................................................................................... 6–4
Electrical Drawings .............................................................................................................. 6–5
4520Z Preface:
09.40001Rev 00