4.1.1 Removing loader...................................................................................................................10-19
4.1.2 Reinstalling loader ................................................................................................................10-23
4.2 Bucket, boom and hydraulic cylinders...........................................................................................10-26
4.2.1 Attaching attachments ..........................................................................................................10-26
4.2.2 Removing attachments .........................................................................................................10-28
4.2.3 Removing bucket cylinder.....................................................................................................10-29
4.2.4 Removing boom cylinder and hydraulic tubes ......................................................................10-29
4.2.5 Removing piston rod assembly.............................................................................................10-29
4.2.6 Removing cylinder head, piston and nut...............................................................................10-30
4.2.7 Removing piston seal and O-ring .........................................................................................10-31
4.2.8 Installing O-ring and piston seal ...........................................................................................10-31
4.3 Side frames, front guard and main frames....................................................................................10-31
4.3.1 Removing side frames ..........................................................................................................10-31
4.3.2 Removing front guard ...........................................................................................................10-32
4.3.3 Removing main frames.........................................................................................................10-32
4.4 3rd function valve (If equipped).....................................................................................................10-32
4.4.1 Removing 3rd function valve ................................................................................................10-32
4.4.2 Removing hydraulic tubes of 3rd function.............................................................................10-33
5. Servicing...............................................................................................................................................10-33
5.1 Piston rod ......................................................................................................................................10-33
5.1.1 Checking piston rod bend .....................................................................................................10-33
MECHANISM ................................................................................................................................................... 11-1
1. Hydraulic circuit ...................................................................................................................................... 11-1
2. Control valve........................................................................................................................................... 11-2
2.1 Structure of backhoe control valve.................................................................................................. 11-2
2.2 Function of backhoe control valve................................................................................................... 11-4
2.2.1 Backhoe control valve in neutral position ............................................................................... 11-4
2.2.2 Backhoe control valve in swing right position ......................................................................... 11-5
2.2.3 Backhoe control valve in swing left position ........................................................................... 11-6
2.2.4 Backhoe control valve in boom up position ............................................................................ 11-7
2.2.5 Backhoe control valve in boom down position........................................................................ 11-8
2.2.6 Backhoe control valve in L.H. stabilizer shrink position .......................................................... 11-9
2.2.7 Backhoe control valve in L.H. stabilizer extend position....................................................... 11-10
2.2.8 Backhoe control valve in R.H. stabilizer shrink position ....................................................... 11-11
2.2.9 Backhoe control valve in R.H. stabilizer extend position ...................................................... 11-12
2.2.10 Backhoe control valve in dipperstick crowd position........................................................... 11-13
2.2.11 Backhoe control valve in dipperstick extend position.......................................................... 11-14
2.2.12 Backhoe control valve in bucket roll-back position ............................................................. 11-15
2.2.13 Backhoe control valve in bucket dump position.................................................................. 11-16
2.3 Structure of overload relief valve................................................................................................... 11-17
2.3.1 Function of relief position...................................................................................................... 11-17
2.3.2 Function of anti-cavitation position ....................................................................................... 11-18
3. Structure of hydraulic cylinder .............................................................................................................. 11-19
SERVICING ................................................................................................................................................... 11-21
1. Troubleshooting for backhoe ................................................................................................................ 11-21
2. Servicing specifications for backhoe .................................................................................................... 11-23
3. Tightening torques for backhoe ............................................................................................................ 11-25
4. Checking and adjusting ........................................................................................................................ 11-26
4.1 Checking relief valve setting pressure .......................................................................................... 11-26
4.2 Checking control lever operation force.......................................................................................... 11-26
4.3 Checking stabilizer control lever operation force .......................................................................... 11-26
5. Disassembling and assembling ............................................................................................................ 11-26
5.1 Removing backhoe ....................................................................................................................... 11-26
5.1.1 Preparing to remove backhoe............................................................................................... 11-26
5.1.2 Releasing mounting pins ...................................................................................................... 11-27
5.1.3 Disconnecting hydraulic hoses ............................................................................................. 11-28
BX23S, LA340, BT603, RCK54D, RCK60D, RCK54, RCK60B
xv
KiSC issued 03, 2017 A
