Hydraulic System Manual: Kaiyi HA30 — Schematics & Pump Setup (EN)

Chapter 5 Hydraulic system

Стр. 1

HYDRAULIC SYSTEM Ch 5 page 2 Hydraulic system Index Components, capacities and oil types...............................................

3 Hydraulic system main function.......................................................................................................4 Hydraulic parts view HA30 .............................................................................................................5 Hydraulic System Description.........................................................................................................5 Hydraulic System Components.......................................................................................................6 Main Valve Circuit (Up to 7X1750 / 8X1718)...................................................................................8 Main Valve Circuit (From 7X1751 / 8X1719)...................................................................................9 Main Valve - List Of Components..................................................................................................10 Main Valve - Spare Parts & Torques..............................................................................................12 Hydraulic circuit HA30-45 (Up to 7X1836 / 8X1765).....................................................................19 Hydraulic circuit HA30-45 (From 7X1837 / 8X1766).....................................................................21 Startup test procedure ......................................................................

23 Main Pump..........................................................................................

24 Pump description..........................................................................................................................24 Test block......................................................................................................................................25 Main pump pressure adjusting......................................................................................................26 Main pump pressure adjusting......................................................................................................27 Main pump circuit..........................................................................................................................28 Main pump parts list......................................................................................................................28 Main pump exploded view.............................................................................................................29 Steering system.................................................................................

31 Orbitrol..........................................................................................................................................32 Steering valve...............................................................................................................................35 Steering circuit HA30 / DA40........................................................................................................36 Steering Cylinder..........................................................................................................................37 Steering cylinder, sectional drawing..............................................................................................39 Steering cylinder Repair Instructions............................................................................................40 Emergency steering pump............................................................................................................42 Tilting system.....................................................................................

45 Tilt Lever........................................................................................................................................45 View of the tilting system...............................................................................................................46 Tilt cylinders:.................................................................................................................................47 Tilt cylinder, sectional drawing.......................................................................................................49 Tilt cylinder Repair Instructions.....................................................................................................50 Fan system.........................................................................................

52 Fan Drive Motor.............................................................................................................................53 Disassemble the fan and fan motor...............................................................................................54 Brakes.................................................................................................

55 Brake circuit view (Up to 7X1836 / 8X1765)..................................................................................55 Brake circuit view (From 7X1837 / 8X1766)..................................................................................56 General discription........................................................................................................................57 Parking brake, description.............................................................................................................57 Parking brake circuit view..............................................................................................................58 Service brake, description.............................................................................................................59 Accumulators.....................................................................................

60 Description of the Accumulators...................................................................................................60 Filling table of Correction Factors..................................................................................................63 Main valve pressure adjustment:...................................................................................................64 Brake cooling system....................................................................................................................65 SHOP MANUAL

Стр. 2

Ch 5 page 3 HYDRAULIC SYSTEM Components, capacities and oil types Oil type: Hydraulic fluid: ISO-VG 32 (Viscosity 32) BIO oil can be used BIO oil cannot be mixed with hydraulic oil and system need to be flushed Type of BIOoil to be accepted by Hyundai NOTE For fluid type and specifications, refer to the Hyundai Operating & Maintenance Manual Chapter 6. Hydraulic tank: HA30 HA45 Two chamber tank Volume oil tank 63L 63L Volume system 150L 160L NOTE If work is performed on the hydraulic system replace broken seals. Contact your Hyundai dealer for seal kit. Figure 1 SHOP MANUAL

Стр. 3

HYDRAULIC SYSTEM Ch 5 page 4 Hydraulic system main function. The hydraulic system has one pump. The steering system, brake system, self leveling suspension, tilting functions and the cooling fan functions are fed by the hydraulic pump (140ccm/rev.), driven by the engine. The emergency steering system is fed by the emergency steering pump (maximum 50 l/min) which is driven by the truck’s motion, either forwards or backwards. The hydraulic system has three primary functions: First primary function : supply the steering power and transmit the drivers steering motion from the steering wheel to the steering cylinders, and safely maintain the steering function if the engine fails.

Second primary function : supply the brake and suspension accumulator with pressure in the accumulator chamber and feed the cooling fan motor which provides sufficient fan speed to maintain the engine operating temperature within given limits. Third primary function : supply power to the tilting cylinders to manage unloading the dumper body. SHOP MANUAL

Стр. 4