TECHNICAL MANUAL

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BACKHOE COMPONENT LOCATION BACKHOES 48 BOOM Dipperstick Dipperstick Cylinder Boom Cylinder Bucket Cylinder Swing Cylinder MODEL 47 MODEL 48 MODEL 47 MODEL 48 3-6 6/22/99
BACKHOES THEORY OF OPERATION THEORY OF OPERATION CONTROL VALVES The hydraulic control valve consists of individual valve sections stacked side-by-side with a continuous open center for all tractors. All sections have a self centering spool that directs pressure to one of the hydraulic cylinders. The open center systems have a main system relief valve that protects the whole backhoe hydraulic system from sharp pressure shocks. It is adjustable by adding or removing shims but should not be adjusted to a higher or lower value than recommended. In addition, two of the individual circuits are protected by circuit relief valves that are adjustable, but again, they should not be adjusted to a value that is higher or lower than recommended. RESTRICTORS Restrictors are installed in both ports of the swing valve section, the IN port of the boom valve section, and the IN port of the stabilizer section. The restrictor is a one-way orifice that acts to slow or dampen return oil flow to the valve section. This provides for smooth operation when the boom is lowered or when it is swung from side-to-side. Pressure oil flows around the restrictor and is not affected by the orifice. LOAD CHECK VALVES Each valve section is equipped with load check valves. These check valves prevent reverse fluid flow if supply pressure were lost (The engine stopped running). This feature would prevent opposite direction movement of an implement should supply pressure be lost. MAIN SYSTEM RELIEF VALVE High pressure can be generated by continuing to operate a function after its cylinder has reached its limit. When pressure reaches system relief valve pressure, the valve opens, diverting inlet oil to the return oil passage and the rockshaft housing. CIRCUIT RELIEF AND ANTI- CAVITATION CHECK VALVES Circuit relief and anti-cavitation check valves are included in boom, and dipperstick valve sections. During some operations, when the valve spool is in a neutral position, a sudden external force against the bucket will cause a pressure increase in the head end of the cylinder. To relieve that pressure and avoid damage to the valve section, the circuit relief valve opens and allows oil flow to the return oil passage. When the circuit relief valve opens to relieve pressure in the head end of the cylinder, a void is created in the rod end (no incoming oil, valve section in neutral). Oil in the return oil passage unseats the anti-cavitation check valve ball and fills the void in the rod end. 6/22/99 3-7
Page 1 and 2: 4000 Series Compact Utility Tractor
Page 3 and 4: INTRODUCTION This technical manual
Page 5 and 6: SAFETY USE CARE AROUND HIGH- PRESSU
Page 7 and 8: SAFETY AVOID INJURY FROM ROTATING B
Page 9 and 10: SPECIFICATIONS CONTENTS CONTENTS Pa
Page 11 and 12: SPECIFICATIONS & INFORMATION SPECIF
Page 13 and 14: SPECIFICATIONS & INFORMATION O-RING
Page 15 and 16: SPECIFICATIONS & INFORMATION O-RING
Page 17 and 18: SPECIFICATIONS & INFORMATION METRIC
Page 19 and 20: SPECIFICATIONS & INFORMATION LUBRIC
Page 21 and 22: BACKHOES CONTENTS CONTENTS Page SPE
Page 23 and 24: BACKHOES SPECIFICATIONS SPECIFICATI
Page 25: BACKHOES BACKHOE COMPONENT LOCATION
Page 29 and 30: No hydraulic pressure Improper ho
Page 31 and 32: BACKHOES TROUBLESHOOTING Check or S
Page 33 and 34: BACKHOES TESTS AND ADJUSTMENTS TEST
Page 35 and 36: BACKHOES TESTS AND ADJUSTMENTS ROCK
Page 37 and 38: BACKHOES REPAIR SPOOL REMOVAL Proce
Page 39 and 40: BACKHOES REPAIR ASSEMBLE VALVE HOUS
Page 41 and 42: BACKHOES REPAIR Stabilizer Control
Page 43 and 44: BACKHOES REPAIR B B A M94995 3. Ful
Page 45 and 46: BACKHOES CYLINDER REPAIR CYLINDER R
Page 47 and 48: BACKHOES CYLINDER REPAIR STABILIZER
Page 49 and 50: BACKHOES CYLINDER REPAIR BUCKET, BO
Page 51 and 52: BACKHOES CYLINDER REPAIR SWING CYLI
Page 53 and 54: ROTARY MOWERS CONTENTS CONTENTS Pag
Page 55 and 56: ROTARY MOWERS SPECIFICATIONS SPECIF
Page 57 and 58: ROTARY MOWERS GEAR CASE GEAR CASE M
Page 59 and 60: ROTARY MOWERS SPINDLES, DRIVE BELTS
Page 69 and 70: ROTARY TILLERS CONTENTS CONTENTS Pa
Page 71 and 72: ROTARY TILLERS SPECIFICATIONS SPECI
Page 73 and 74: ROTARY TILLERS 550, 660, 670 & 680
Page 75 and 76: ROTARY TILLERS 450 GEAR CASE REMOVA
Page 77 and 78:
ROTARY TILLERS 450 PTO CLUTCH 450 P
Page 79 and 80:
ROTARY TILLERS 550 GEAR CASE REMOVA
Page 81 and 82:
ROTARY TILLERS 550 GEAR CASE REMOVA
Page 83 and 84:
ROTARY TILLERS 660, 670 & 680 GEAR
Page 85 and 86:
ROTARY TILLERS ROTOR BEARING REPLAC
Page 87 and 88:
POST HOLE DIGGER CONTENTS CONTENTS
Page 89 and 90:
POST HOLE DIGGER SPECIFICATIONS SPE
Page 91 and 92:
POST HOLE DIGGER GEAR BOX REMOVAL A
Page 93 and 94:
POST HOLE DIGGER GEAR BOX DISASSEMB
Page 95 and 96:
POST HOLE DIGGER GEAR BOX ASSEMBLY
Page 97 and 98:
POST HOLE DIGGER GEAR BOX ASSEMBLY
Page 99 and 100:
BLADES CONTENTS CONTENTS Page SPECI
Page 101 and 102:
BLADES SPECIFICATIONS SPECIFICATION
Page 103 and 104:
ROTARY BROOMS CONTENTS CONTENTS Pag
Page 105 and 106:
ROTARY BROOMS SPECIFICATIONS SPECIF
Page 107 and 108:
ROTARY BROOMS COMPONENT LOCATION BR
Page 109 and 110:
ROTARY BROOMS COMPONENT LOCATION GE
Page 111 and 112:
ROTARY BROOMS REPAIR F 8. Center th
Page 113 and 114:
ROTARY BROOMS REPAIR AK AJ AL M9966
Page 115 and 116:
ROTARY BROOMS REPAIR 18. Slide the
Page 117 and 118:
ROTARY BROOMS REPAIR AP AO 26 GEAR
Page 119 and 120:
ROTARY BROOMS REPAIR D 23. Install
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ROTARY BROOMS REPAIR I K N O M99706
Page 123 and 124:
ROTARY BROOMS REPAIR K L J I R Q P
Page 125 and 126:
ROTARY BROOMS REPAIR K C E E F B M9
Page 127 and 128:
SNOWBLOWERS CONTENTS CONTENTS Page
Page 129 and 130:
SNOWBLOWERS SPECIFICATIONS SPECIFIC
Page 131 and 132:
SNOWBLOWERS 59 CHUTE CONTROL 59 CHU
Page 133 and 134:
SNOWBLOWERS 59 GEAR CASE Blower Fan
Page 135 and 136:
SNOWBLOWERS 59 GEAR ASSEMBLY: to cl
Page 137 and 138:
SNOWBLOWERS 59 MAIN GEAR CASE INSPE
Page 139 and 140:
SNOWBLOWERS ROTOR AND FAN REMOVAL A
Page 141 and 142:
SNOWBLOWERS FAN OR COUPLER REPLACEM
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MISCELLANEOUS CONTENTS CONTENTS Pag
Page 145 and 146:
MISCELLANEOUS HOSES & FITTINGS HOSE
Page 147 and 148:
MISCELLANEOUS HOSES & FITTINGS HOSE
Page 149 and 150:
4000 SERIES CUT’S ATTCHMENTS INDE
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TECHNICAL MANUAL

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