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Manitowoc Grove GRT880 Service Manual

Manitowoc Grove GRT880
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2-1
GROVE
GRT880 SERVICE MANUAL HYDRAULIC SYSTEM
2
Published 10/19/2017, Control # 618-00
SECTION 2
HYDRAULIC SYSTEM
SECTION CONTENTS
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Hydraulic Symbols . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Hydraulic System Maintenance Precautions . . . . 2-5
Label Parts when Disassembling . . . . . . . . . . . . . 2-5
Hydraulic Oil Recommendations. . . . . . . . . . . . . . 2-5
Draining and Flushing. . . . . . . . . . . . . . . . . . . . . . 2-5
Removing Air From the Hydraulic System . . . . . . 2-6
Parts Replacement . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Directional Control Valves. . . . . . . . . . . . . . . . . . . 2-7
Visual Inspection of Hoses and Fittings . . . . . . . . 2-8
Supply Pressure And Return Circuit . . . . . . . . . . 2-9
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Hydraulic Pump Distribution . . . . . . . . . . . . . . . . 2-11
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Troubleshooting Aids . . . . . . . . . . . . . . . . . . . . . 2-13
Troubleshooting Procedures. . . . . . . . . . . . . . . . 2-13
Hydraulic Oil Return Filter Assembly . . . . . . . . . 2-14
Fill Cap/Breather. . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Oil Cooler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Hydraulic Pumps . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20
Pressure Setting Procedures . . . . . . . . . . . . . . . 2-23
Checking/Setting the Piston Pumps Cut-off and
Differential Pressures . . . . . . . . . . . . . . . . . . . . . 2-24
Checking/Setting the Main Directional Control
Valve, Hoists, Lift, and Telescope Pressures . . . 2-26
Checking/Setting the Pilot Supply Pressure . . . . 2-30
Checking/Setting the Front Steer Pressure . . . . 2-30
Checking/Setting the Swing Brake Release
Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
Checking the Swing Work Pressure . . . . . . . . . . 2-31
Checking the Service Brake Accumulator
Charging Valve Pressure . . . . . . . . . . . . . . . . . . 2-32
Checking the Service Brake Accumulators
Pre-charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33
Pre-charging the Accumulators. . . . . . . . . . . . . . 2-34
Checking/Setting Cab Tilt, Counterweight
Removal, and Counterweight Pinning
Pressures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35
Checking/Setting the Outriggers, Rear Steer,
and Hydraulic Transmission Oil Cooler Fan
Motor Pressures . . . . . . . . . . . . . . . . . . . . . . . . . 2-36
Checking/Setting the Axle Lockout Circuit
Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-38
Checking/Setting the Luffing Jib Pressure. . . . . . 2-38
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39
Main Directional Control Manifold Valve. . . . . . . 2-42
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42
Swing Manifold Valve . . . . . . . . . . . . . . . . . . . . . . 2-46
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46
Compact Manifold Valve. . . . . . . . . . . . . . . . . . . . 2-49
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49
Accessory Manifold Valve . . . . . . . . . . . . . . . . . . 2-52
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52
Lift Cylinder and Telescope Cylinder
Control Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56
Carrier Combination Manifold Valve . . . . . . . . . . 2-57
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57
Outrigger Control Manifold. . . . . . . . . . . . . . . . . . 2-61
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-61
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-61
Range Shift/Park Brake Manifold Valve. . . . . . . . 2-63
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63
Telescope and Tele Fill Stage Select
Manifold Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64
Dual Accumulator Charge Manifold Valve . . . . . 2-66
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66
Hydraulic Brake Accumulator . . . . . . . . . . . . . . . 2-68
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68
Reference Only

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Manitowoc Grove GRT880 Specifications

General IconGeneral
BrandManitowoc
ModelGrove GRT880
CategoryConstruction Equipment
LanguageEnglish

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