I-4 SHB 28Z3 EN - Edition 2.0 * 28Z3s20IVZ.fm
Removing the injection pump .......................................................................... 4-12
Fitting the injection pump ................................................................................. 4-13
Measuring and adjusting the engine speed ........................................................... 4-14
Compression .......................................................................................................... 4-14
Checking the coolant thermostat ........................................................................... 4-15
Checking the thermal switch .................................................................................. 4-15
Oil pressure switch ................................................................................................. 4-16
Checking the coolant circuit ................................................................................... 4-16
Cleaning the cooling water channels ..................................................................... 4-16
Coolant and fuel hoses .......................................................................................... 4-16
Crankcase vent ...................................................................................................... 4-17
Replacing the glow plugs ....................................................................................... 4-17
Engine trouble ........................................................................................................ 4-18
Hydraulic system
Hydraulic pump PVD-0B-23BP-8G3-5083A ............................................................ 5-2
Pump unit: exploded view .................................................................................. 5-4
Pilot oil supply unit ............................................................................................. 5-5
Dismantling the hydraulic pump ......................................................................... 5-6
Assembling the hydraulic pump ......................................................................... 5-8
Troubleshooting on the hydraulic pump ........................................................... 5-12
Main valve block .................................................................................................... 5-13
Ports ................................................................................................................ 5-13
Main control lines (legend) ............................................................................... 5-14
Pump/tank lines ............................................................................................... 5-14
Main valve block diagram ................................................................................ 5-15
Pressure limiting valves ................................................................................... 5-16
Pump assignment ............................................................................................ 5-17
Drive counterbalancing system .............................................................................. 5-18
Pump assignment for drive counterbalancing .................................................. 5-18
Regeneration – stick section .................................................................................. 5-19
Bucket pre-tension ................................................................................................. 5-19
Auxiliary hydraulics flow rate adjustment ............................................................... 5-20
Travelling drive ....................................................................................................... 5-21
Function ........................................................................................................... 5-22
Swivel unit .............................................................................................................. 5-24
Swivel unit brake .............................................................................................. 5-25
Swivel joint ............................................................................................................. 5-27
Replace the sealing rings ................................................................................ 5-27
Swivel joint VDS (option) ....................................................................................... 5-28
Pilot valves ............................................................................................................. 5-29
Joystick ............................................................................................................ 5-29
Pilot valve (driving) .......................................................................................... 5-30
Changeover valve for SAE/ISO controls (option) ................................................... 5-32
Proportional valve (option) ..................................................................................... 5-32
Changeover valve VDS (option) ............................................................................ 5-33
3/2 directional valve (option) .................................................................................. 5-33
Easy Lock valve (option) ........................................................................................ 5-33
Hydraulic oil tank service valve (option) ................................................................. 5-34
Breather filter ......................................................................................................... 5-34
Auxiliary hydraulics connections ............................................................................ 5-35
Troubleshooting in the hydraulic system ................................................................ 5-36
Hydraulics diagram (legend) .................................................................................. 5-38
Hydraulics diagram 28Z3 ....................................................................................... 5-39
Hydraulics diagram for options 28Z3 ..................................................................... 5-40
Main valve block diagram 28Z3 ............................................................................. 5-41
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