Tatu Marchesan SDA3 Скачать руководство пользователя страница 31

Страница: 31 / 112

SDA³ / SDA³ E - Rev.04 - Mar / 22

5. Assembly

Hydraulic circuit assembly - lifting the wheel supports

SDA³ 19 row units

Item

Quantity

Description

Ø 3/8 x 3500 TC-TM hose (Black / Red)

Pressure

Ø 3/8 x 3500 TC-TM hose (Black / Blue)

Return

Ø 3/8 x 2500 TR-TR hose

Pressure

Ø 3/8 x 3000 TR-TR hose

Return

Hydraulic cylinder

Double oil distributor

Quick coupler

SDA³ 21 & 23 row units

Item

Quantity

Description

Ø 3/8 x 3500 TC-TM hose (Black / Red)

Pressure

Ø 3/8 x 3500 TC-TM hose (Black / Blue)

Return

Ø 3/8 x 2800 TC-TR hose

Pressure

Ø 3/8 x 3200 TC-TR hose

Return

Hydraulic cylinder

Double oil distributor

Quick coupler

SDA³ 27 & 29 row units

Item

Quantity

Description

Ø 3/8 x 3500 TC-TM hose (Black / Red)

Pressure

Ø 3/8 x 3500 TC-TM hose (Black / Blue)

Return

Ø 3/8 x 3600 TR-TR hose

Pressure

Ø 3/8 x 4500 TC-TR hose

Return

Hydraulic cylinder

Double oil distributor

Quick coupler

- If necessary, use thread sealing tape to couple the hoses to the male quick couplers.

Check the functioning of the triple valve above.

NOTE

Содержание SDA3

Страница 1: ...OPERATOR S MANUAL SDA SDA SDA E SDA E...

Страница 2: ...Dealer Owner Firm Farm City State No of the Certificate of Guarantee Serial No Date Invoice No Product Notes IDENTIFICATION...

Страница 3: ...manual contains the necessary information for the best performance of your equipment The operator and the maintenance staff must carefully read the entire manual before working with the equipment The...

Страница 4: ...quipment 33 Spacing between row units table 34 Positioning the row units on the frame 35 Procedures to change the spacing 36 37 Setting the equipment to transport position 38 Procedures before the sow...

Страница 5: ...zer and seed furrow opening Fertilizer depth 83 TATU electronic hectare meter 84 TATU electronic hectare meter adjustment 85 10 Maintenance 86 to 106 Lubrication 86 Lubricate every 10 hours of service...

Страница 6: ...ce of the equipment The instructions in this manual indicates how to get the best performance and allow the operator to get maximum income increasing the equipment lifetime This manual should be read...

Страница 7: ...nvironment Products such as oil fuel filters batteries and others are spilt over the soil and can penetrate to the underground layers compromising nature Ecological and conscious disposal of them shou...

Страница 8: ...movement Be careful while driving on slopes Risk of overturn Prevent that chemical products i e fertilizers and treated seeds make any contact with your skin or clothes Keep access and work places cle...

Страница 9: ...h the power take off PTO which you should not get closer during operation The presence of any other people on the tractor or equipment is stricly forbidden Have extreme caution when driving under elec...

Страница 10: ...and arms from the abrasive elements that may cause cuts or scratches Whenever assembling or elements that may cause cuts or scratches Whenever assembling or disassembling the equipment always use safe...

Страница 11: ...bstacles or hazardous locations 6 Use personal protective equipment PPE 7 Wear appropriate clothes and footwear Avoid tight or hanging clothes that Avoid tight or hanging clothes that may become entan...

Страница 12: ...re outbreak or any possible hazard the operator must leave the area as fast as possible and look for a safe place Always have emergency numbers in hands 21 Do not allow any person or animal to get und...

Страница 13: ...rpin the equipment wheels appropriately 7 Use chock blocks and safety chains to secure the equipment to the truck or trailer during the transport 8 Stay away from the straps cables or chains that are...

Страница 14: ...egulatory Standard NR 12 This Regulatory Standard and its annexes provide technical references basic principles and protective measures to ensure the health and physical integrity of workers and estab...

Страница 15: ...no permita la permanencia de personas sobre la m quina EVITE ACIDENTES AVOID ACCIDENTS EVITE ACCIDENTES 05 03 03 1942 El lacre podr ser removido solamente por el propietario O lacre somente poder ser...

Страница 16: ...R DRIVE SHAFT EJE MOTOR EIXO MOVIDO DRIVEN SHAFT EJE MOVIDO ADUBO FERTILIZER ABONO C D 38 34 30 26 22 18 14 38 34 30 26 22 18 14 REC MBIO DE ENGRENAGENS SPROCKET COMBINATIONS CAMBIO DE ENGRANAJES TRA...

Страница 17: ...pper logotype 190 x 255 05 03 03 3853 01 Manual seal decal 05 03 03 1942 02 1 coil pitch auger decal 15 23 05 03 03 0897 02 1 coil pitch auger decal 24 29 05 03 03 03 04 02 2 coil pitch auger decal 15...

Страница 18: ...fertilizer distribution greater versatility during operations and proper fittings to your needs as the main advantages The seeds are distributed by a seed metering system with simultaneous seed disch...

Страница 19: ...Hoppers capacity liters Height mm Length mm Tractor required power cv Seeds Fertilizer 15 158 595 570 1850 4000 80 90 19 158 755 720 90 95 21 175 905 860 95 105 23 158 905 860 95 105 27 175 1125 1070...

Страница 20: ...18 SDA SDA E Rev 04 Mar 22 3 Data sheet B B A A D D C C E E Equipment dimensions...

Страница 21: ...ed double discs with depth control adjustable scrapers 13 x 15 unaligned double discs optional Depth control Press wheel without lubrication V shaped rubber or iron press wheel Working speed 8 km h re...

Страница 22: ...06 06 06 03 03 02 02 01 01 Fully assembled 10 10 11 11 12 12 01 Frame 02 Drawbar 03 Extensor 04 Fertilizer hopper 05 Seed hopper 06 Wheel 07 Hydraulic circuit 08 Row marker optional 09 Longitudinal tr...

Страница 23: ...els for no till sowing with standard sowing with standard iron wheel for SDA E iron wheel for SDA E V press wheel V press wheel for no till sowing for no till sowing standard for SDA standard for SDA...

Страница 24: ...cotter pin on the upper part and a pin G and cotter pin on the lower part 4 Lock the valve support I to the drawbar A using bolts J spring washers and nuts A A B B C C D D I I J J E E F F G G H H Onl...

Страница 25: ...e in the female quick couplers of the tractor In this case the tractor must have four rear outputs NOTE If necessary use a thread sealing tape to couple all hoses to the cylinders and the male quick c...

Страница 26: ...Black Red Pressure Pressure 02 02 3 8 x 4600 TR TM hose Black Blue Return Return 03 02 Row unit lifting cylinder 04 04 Quick coupler Hydraulic circuit assembly tractor with double command Row unit Row...

Страница 27: ...enser A to the support which is placed in the frame using bolts B flat and spring washers and nuts 2 Fasten the support C of the triple valve to the drawbar using bolts D spring washers and nuts 3 The...

Страница 28: ...d on the frame using a bolt spring washer and nut Lock the triple valve B to the support located on the drawbar The triple valve B is locked by bolts flat and spring washers and nuts Assemble the hose...

Страница 29: ...der 07 02 Quick coupler S D A 2 1 2 3 r o w u n i t s Item Quantity Description 01 01 3 8 x 1400 TC TM hose Black Red Pressure Pressure 02 01 3 8 x 3500 TC TM hose Preto Azul Return Return 03 02 3 8 x...

Страница 30: ...e wheel supports 01 01 02 02 03 03 03 03 04 04 04 04 06 06 05 05 05 05 Wheel support Wheel support 07 07 07 07 Wheel support Wheel support If necessary use thread sealing tape to couple the hoses to t...

Страница 31: ...k Red Pressure Pressure 02 01 3 8 x 3500 TC TM hose Black Blue Return Return 03 02 3 8 x 2800 TC TR hose Pressure Pressure 04 02 3 8 x 3200 TC TR hose Return Return 05 02 Hydraulic cylinder 06 01 Doub...

Страница 32: ...he most used ways to increase the soil traction and give greater stability to the tractor Check if the tractor is in its full condition before using it The drawbar is used to get a better power suppli...

Страница 33: ...int direction 3 Use a clean cloth or a paper towel to clean the couplers in the end of the hoses Also clean the area around the tractor couplers 4 Activate the clutch to turn on off the activation sys...

Страница 34: ...uipment direction and be ready to brake at any time Connect the hoses to the hydraulic control valve Note that the tractor drawbar must remain fixed during work and transportation Hitching to the trac...

Страница 35: ...clean the quick coupler surface Couple the hoses by pushing the quick coupler on the connections until it locks The uncoupling is done by pulling the quick coupler this is the Push Pull system Before...

Страница 36: ...e table below Follow the assembly instructions on the positioning the row units on the frame page Model Number of row units Spacing mm SDA SDA E 13 SDA SDA E 15 05 450 07 300 09 250 11 200 13 175 15 1...

Страница 37: ...ing Left row unit Left row unit Note that the row units are right and left Check the figures above The central row unit must be long The H spring fastener has the function to keep the spacings of 158...

Страница 38: ...ge the spacing on a clean flat and firm location Make sure that the seeder is properly supported Release the row units by loosening the nuts A and B Remove only the row units which will not be used th...

Страница 39: ...place the chutes H over the augers The chute H can be found inside the components box H H If necessary displace the hydraulic cylinders F along with the supportive bearings G To allow the desired spac...

Страница 40: ...nsportation always use the rod locks B of the hydraulic cylinders NOTE It is recommended to fill up the seeder only on the work place Never transport the seeder with load excess Lock the wheel support...

Страница 41: ...the seeder only on the work place Never transport the seeder with load excess Check the tires inflation keeping the same pressure Also check if there is any object inside the hoppers that may damage...

Страница 42: ...The seed metering box features three adjustments points used for different grain sizes as follows Point 1 For small sized seeds wheat rice oats and similar ones Point 2 For medium sized seeds such as...

Страница 43: ...ween row units kg ha 158 mm 175 mm 200 mm 220 mm 250 mm 316 mm 350 mm 400 mm 450 mm 0 5 13 16 15 13 11 10 08 07 06 05 1 0 28 35 32 28 25 22 18 16 14 12 1 5 43 54 49 43 39 34 27 25 22 19 2 0 60 76 68 6...

Страница 44: ...33 29 26 23 1 5 95 60 54 48 42 38 2 0 134 85 77 67 60 54 2 5 184 116 105 92 82 74 3 0 236 150 135 118 103 94 3 5 281 178 160 140 125 112 4 0 326 206 186 163 145 130 4 5 373 236 213 187 166 149 5 0 422...

Страница 45: ...tener A Remove the cotter pins that fasten the drive A and driven B shafts and replace them using the sprockets that can be found inside the components box Keep the equipment turned off when changing...

Страница 46: ...es indicate the obtained amounts using a 3 4 coil pitch auger optional This auger carries approximately 10 grams of commercial granulated fertilizer per turn The tables for seed and fertilizer distrib...

Страница 47: ...6x6 18x6 49 55 63 65 73 80 81 84 88 92 98 101 105 107 110 114 117 122 126 128 133 147 161 165 167 171 176 183 188 195 201 205 213 220 234 240 244 256 264 269 293 330 342 391 440 158 mm 175 mm 200 mm 2...

Страница 48: ...BE MADE IN THE OWN FIELD WHERE THE PLANTATION WILL TAKE PLACE AND IN NORMAL WORKING SPEED HECTARE 10 000 m AVERAGE SPEED 08 Km h NOTA NOTE SPROCKETS DRIVE SHAFT x DRIVEN SHAFT 158 mm 175 mm 200 mm 220...

Страница 49: ...O N TA B L E O F G R A N U L AT E D C O M M E R C I A L F E R T I L I Z E R TA B L A D E D O S I F I C A C I N D E F E RT I L I Z A N T E C O M E R C I A L G R A N U L A D O 158 mm 175 mm 200 mm 220 m...

Страница 50: ...tic bags Move the tractor along the delimited area using the same speed that you will work throughout the sowing Recommended average speed 8 km h Now just weigh the fertilizer and seeds contained in t...

Страница 51: ...using the formula below which contains the following elements A area to be seeded or fertilized m B spacing between rows of the crop mm C amount of fertilizer to be distributed in the area kg D distan...

Страница 52: ...e straw stubble is the one that is coupled to the rim the other one performs the furrow opening for the seeds and fertilizer NOTE In case there is a very thick or hard to cut layer we recommend using...

Страница 53: ...ops can be found inside the components box NOTE The sowing depth is controlled by activating the hydraulic cylinders which acts on the axle of the row lift To keep a constant working depth use the dep...

Страница 54: ...e unaligned double discs on the disc blades that cut the stubble The 310 mm rim is standard and comes with the equipment the others are optionals as described below These rims can be assembled in any...

Страница 55: ...bserving mainly the following factors Crop type Fertilizer type Fertilizer amount Soil moisture The detailed knowledge of these factors allow the definition of the best fertilizer positioning related...

Страница 56: ...sing can be made by the press tires A or by the iron press wheel B Both of them have pressure adjustment over the soil by changing the bolt in the fixation support holes C or in the pressure spring D...

Страница 57: ...cally check the established adjustments at the beginning of sowing 10 Give special attention to the position of the fertilizer related to the seed 11 Carefully check the seed depth and the compaction...

Страница 58: ...ty that is inside the reservoir condenses If filled up the air volume inside the reservoir exits through the breather The operator must known the tractor operation commands to assure safety preservati...

Страница 59: ...the arm adjuster and place the lock pins At this moment the extension thread of the upper arm can be used to approach or put away the planter to facilitate the hitching 2 Place the upper arm third po...

Страница 60: ...them using the transport locks B 3 Totally retreat the wheel support cylinder A A B B The extensor C and the other components that were removed from the drawbar must remain near the equipment or on an...

Страница 61: ...s and let them touch the soil also avoiding to be underneath the wheels J 8 Lift the jacks K 9 With the help of the tractor hydraulic system lift one side of the equipment until the wheels J are on tr...

Страница 62: ...rry out the transportation during the night 6 Use the safety devices on the hydraulic cylinders 7 A speed of 20 km h is recommended for a safer transportation Avoid to surpass this speed limit to prev...

Страница 63: ...ers spring washers and nuts Couple the marker arms B to the supports A using bolts C bushings flat washers spring washers and nuts Assemble the hydraulic cylinders to the arms B and fasten them to the...

Страница 64: ...rear outputs Fasten the oil distributor A to the frame using bolts B flat and spring washers and nuts Assemble the sequence valve C to the frame center using bolts D and flat and spring washers Assem...

Страница 65: ...ibutor 13 13 05 05 05 05 08 08 09 09 07 07 06 06 14 14 10 10 11 11 15 15 Row unit Row unit lifting lifting Row marker Row marker 04 04 01 01 02 02 03 03 12 12 Row unit Row unit lifting lifting If nece...

Страница 66: ...valve 18 01 Single oil distributor 19 02 Quick coupler SDA 15 and 19 row units Item Quantity Description 01 01 3 8 x 300 TR TR hose Return Return 02 01 3 8 x 650 TR TR hose Return Return 03 01 3 8 x 1...

Страница 67: ...hers and nuts Assemble the sequence valve C to the frame center using bolts D and flat and spring washers Assemble the triple valve to the drawbar according to the instructions on the actvation assemb...

Страница 68: ...7 17 13 13 13 13 19 19 02 02 03 03 04 04 05 05 06 06 11 11 07 07 08 08 09 09 10 10 Row unit Row unit lifting lifting Wheel Wheel support support Row marker Row marker 12 12 18 18 Row marker Row marker...

Страница 69: ...Triple valve 20 01 Double oil distributor 21 01 Single oil distributor 22 04 Quick coupler SDA 19 row units SDA 19 row units Item Quantity Description 01 01 3 8 x 300 TR TR hose Return Return 02 01 3...

Страница 70: ...ve 19 01 Triple valve 20 01 Double oil distributor 21 01 Single oil distributor 22 04 Quick coupler Hydraulic circuit with double command SDA 27 and 29 row units Item Quantity Description 01 01 3 8 x...

Страница 71: ...Tractor gauge i e 142 cm Example 90 x 4 1 142 90 x 5 142 450 142 308 2 2 2 2 X X X X X 154 NOTE For this practical adjustment it is necessary to maintain the front and rear gauges equally In other wo...

Страница 72: ...TO RAISE OR MOVE THE PLANTER CHECK FOR PEOPLE OR ANIMALS NEAR OR UNDER THE PLANTER ESPECIALLY IN THE ROW MARKER ACTION AREA A A B B D D The marker discs feature angle adjustments to facilitate the soi...

Страница 73: ...ble Double sprocket sprocket Assemble the fine seeds distribution hopper A to the seeder hopper B using bolts washers and nuts Couple the sprocket C and the double sprocket on the side of the hoppers...

Страница 74: ...g A which activates the rotors opening in the graduated scales This adjustment is achieved by loosening the lock nuts B and turning the adjusting bushing A while observing the graduated scale C ATTENT...

Страница 75: ...or over surface Seed Seed Fertilizer Fertilizer The TATU seeder models SDA SDA E can perform a lateral and incorporated fertilizing next to and below the seeds as required to soybean and other culture...

Страница 76: ...nce of the SDA and SDA E seeders Marchesan optionally supplies the seed metering for large seeds Minimum spacing allowed 400 mm Minimum distance between fertilizer seed 20 mm Components 01 Seed row un...

Страница 77: ...04 600 04 650 04 700 03 900 SDA SDA E 19 09 316 08 400 07 450 06 500 06 525 06 550 04 600 04 650 04 700 04 900 Table regarding the number of row units and spacings for using the horizontal metering i...

Страница 78: ...04 175 SDA E 27 SDA E 29 15 316 14 316 12 400 11 450 10 500 09 525 09 550 08 600 08 650 08 700 06 900 Row units and spacings table Table regarding the number of row units and spacings for using the ho...

Страница 79: ...chain A assembly related to the tightener NOTE 9 Optional Remove all rows units of the seeder Close the seed outlets over the rotors See the procedures to change the spacings page Remove the lateral...

Страница 80: ...ings that comes with the seeder Pass the hexagonal axle C through the front part of the seed row unit Then couple the bearing D along with the lower sprocket E Assemble the chain tightener the upper s...

Страница 81: ...in the Drive A and Driven B shafts See on the following pages the different amounts of distributed seeds for the plates of corn soybean and bean according to the sprocket combinations in the Drive an...

Страница 82: ...to the used sprockets NOTE Use a false ring of 4 mm of thickness The use of graphite powder mesh 200 half tablespoon for every 20 kg of seeds is to help the corn distribution Follow the instructions a...

Страница 83: ...f seeds in 10 linear meters 12 11 13 12 10 14 14 11 15 14 10 17 12 08 18 16 10 19 14 08 21 18 10 22 16 08 23 18 08 26 16 06 32 18 06 36 BEAN For bean plantation plate with 34 slots Consider 02 two see...

Страница 84: ...9 Corn Pumpkin 28 slots 11 x 8 mm 4 mm 05 03 01 6200 Corn Gray 28 holes 13 5 mm 4 mm 05 03 01 6201 Corn Pink 28 holes 13 mm 4 mm 05 03 01 6202 Corn Light blue 28 holes 12 5 mm 4 mm 05 03 01 6203 Corn...

Страница 85: ...ays next to and below the seeds To change the fertilizer distance related to the seeds it is necessary to displace the fertilizer row on the frame as well as its rod These unaligned double discs featu...

Страница 86: ...otal hectare and number of turns of the transmission shaft Check the assembly sequence on the illustration below Fasten the hectare meter A to the support B which must be secured by bolts on the rear...

Страница 87: ...l hectare to zero Press the PLUS button to reset the partial hectare or press the MINUS button to save the registered value of the partial hectare Press the MENU button two 02 times to see the total h...

Страница 88: ...rt an enough amount of new grease Carry out the lubrication intervals stricly on the different spots of the equipment IMPORTANT Only QUALIFIED CAPABLE and AUTHORIZED personnel must carry out the maint...

Страница 89: ...87 SDA SDA E Rev 04 Mar 22 Lubricate every 10 hours of service 10 Maintenance NOTE Lubricate the points shown above and all grease fittings as well...

Страница 90: ...88 SDA SDA E Rev 04 Mar 22 10 Maintenance Lubricate every 20 hours of service Lubricate every 30 hours of service NOTE Lubricate the points shown above and all grease fittings as well...

Страница 91: ...seed meterings C totally to let the outputs free Spray some water again on the fertilizer hopper axles after turning their axles using a 19 mm 3 4 wrench Remove all transmission chains seed and fertil...

Страница 92: ...ashers 5 After replacing the disc blades D retighten both sides of the hub 6 Being the disc blades assembled check if they are turning freely If the disc are touching or if they are being forced the o...

Страница 93: ...Verify the existence of looseness and the conditions of bearings retainers and bushings Replace the damaged components or with excessive wear The hubs without grease fittings should be assembled with...

Страница 94: ...in that is in need of a repair 5 After repairing or replacing the chain return it to its original position and adjust the tighteners until the chain is totally stretched out A A B B B B B B C C D D E...

Страница 95: ...o transport position page 3 If there is any row marker it must be locked using the transport lock B 4 Loosen up the nuts C that fasten the wheel to the hub 5 Totally retreat the wheel support cylinder...

Страница 96: ...equipment to transport position page 3 If there is any row marker it must be locked using the transport lock B 4 Remove the tires as mentioned on the previous page 5 Totally retreat the wheel support...

Страница 97: ...avoid breaking it and the unavailability of the equipment as well as a higher cost for repairing it because when the bearing breaks during working more parts of the set gets damaged Check the retainer...

Страница 98: ...ce of clearances and the condition of the bearings and retainers Replace any damaged component or with excessive wear The bearing must be replaced in a preventive way to avoid breaking it and the unav...

Страница 99: ...nd the fixation nut G by the frontal part of the metering Remove the grease fitting H from the rear part of the metering to release the other parts as shown in the illustration and replace the defecti...

Страница 100: ...e Check if there is any clearance on the bearings If necessary adjust them by the castle nut Put new grease in the inner part of the hubs along with the bearings as well as in the hubcap reservoir Ass...

Страница 101: ...ssure 170 bar 2400 PSI Operation temperature 40 C to 120 C Technical features Maximum flow rate 70 l min 18 4 gpm Maximum pressure 170 bar 2400 PSI Operation temperature 40 C to 120 C NOTE Use hydraul...

Страница 102: ...ls Proper seal kit Screwdriver and rubber cable Pliers and wrenches Ports Ports NOTE Do not clamp rod by chrome surface Disassembly 1 Remove the end cap A 2 Carefully remove inner assemblies B 3 Disas...

Страница 103: ...tant data section 3 Lube inside of barrel piston seals and gland seals with hydraulic oil 4 With cylinder body held gently insert the inner assemblies B using a slight rocking motion 5 Apply Loctite 2...

Страница 104: ...ure that the seed hopper is positioned in a way that the metering release the seeds on the center of the seed tube Lack of graphite Be sure that the graphite is being used and being mixed on the seed...

Страница 105: ...lly inspect the hydraulic system fasten the connections that are leaking replace the hoses that are almost reaching its expiration date or if they show any cut crack or dryness 11 If there is any prob...

Страница 106: ...n the barrel or other problems consequently leading to internal leakages lack of power gripping damages to the cylinder rods etc Do not attempt any makeshift repairs to the hydraulic lines fittings or...

Страница 107: ...them NOTE The tires must always be properly inflated to avoid premature wear for excess or lack of pressure Do not attempt to mount the tires without experience and adequate storage Maintain the corre...

Страница 108: ...3 6 478 5 648 8 676 5 917 3 M 22 x 2 5 165 5 224 418 441 598 00 647 5 878 01 1 8 254 5 345 1 650 881 4 918 5 1 245 5 M 22 x 1 5 182 246 792 484 656 30 711 5 964 794 1 12 285 5 387 1 729 5 989 2 1031 1...

Страница 109: ...ouza Technical information Luiz Carlos Masetti March 2022 Serial number 05 01 09 0683 Revision 04 MARCHESAN S A reserves the right to make improvements in the design material or specifications of mach...

Страница 110: ...108 SDA SDA E Rev 04 Mar 22 12 Notes...

Страница 111: ...trabajo 11 No efectuar regulajes con el equipo en funcionamiento 12 No permitir que ni os jueguen sobre o pr ximo de los equipos en operaci n durante el transporte o almacenado 13 La velocidad de ope...

Страница 112: ...www marchesan com br...

Результаты поиска

Содержание SDA3

Отзывы:

Бренды по названию

Популярные бренды

Tatu Marchesan SDA3, Руководство оператора

Результаты поиска

Содержание SDA3

Отзывы:

Бренды по названию

Популярные бренды