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Rayco RG74DXH Parts Manual
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Rayco RG74DXH Parts Manual

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RG74DXH
PARTS MANUAL
RAYCO MANUFACTURING © 2018 ALL RIGHTS RESERVED
PRINTED IN USA
INDEX: PMRG74DXH-18

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Summary of Contents for Rayco RG74DXH

  • Page 1 RG74DXH PARTS MANUAL RAYCO MANUFACTURING © 2018 ALL RIGHTS RESERVED PRINTED IN USA INDEX: PMRG74DXH-18...
  • Page 2 RG74DXH Parts Manual Introduction This manual is published by Rayco Manufacturing, Inc. for the readily available for reference at all times. Additional copies benefit of the users of Rayco products. Rayco Manufacturing, of this manual may be purchased from Rayco.
  • Page 3 Parts are readily found through illustrations with accompanying tag to the start switch or to the controls before you service Rayco part numbers. The machine assembly is listed by basic the equipment or before you repair the equipment. groups to enable ease of finding parts.

  • Page 4: Machine Description

    If equipped, use the machine anchorage points and use approved fall arrest harnesses and lanyards. Machine Description The Rayco RG74DXH is a high-production stump cutter powered by a massive 3.8L Cummins 74hp diesel engine that generates peak torque of 295ft-lbs. The large displacement...

  • Page 5: Machine Specs

    Cutter Wheel RPM: 1000 RPM @ 2200 RPM Engine Speed Hitch: Adjustable height 2-5/16” (58.7 mm) Ball Drive Belt: MBL GigaTorque® Jack Stand: Hydraulic Cutting Teeth: RAYCO Super tooth™ forged, one piece, with Tires: (2) 235-75R-17.5H 6000LB tungsten carbide tips. Engine Cutter Teeth Quantity: 40 Maximum Model: Cummins 3.8L, Tier 4/Stage IV, Vertical 4-cycle, Turbo-...
  • Page 6 It is attached to the machine at the location shown. For ready reference, record it in the boxes provided on the Whenever communicating with Rayco or your Rayco dealer, inside front cover of this manual. have your machine serial number handy, as it can help...

  • Page 7: Identification Numbers

    RG74DXH Parts Manual Serial Number Location & Information Serial number is located as shown. Use the below table to record identification numbers and dealer information. Identification Numbers Model Number Serial Number Machine Engine Implement Implement Dealer Information Name Address Dealer Contact...
  • Page 8 RG74DXH Parts Manual Frame Assembly 37486 Rev A. 16 17 18 11 12 ITEM QTY. PART # DESCRIPTION 3501 PIN, TONGUE LOCK 760129 VALVE-ONE BANK JACKSTAND 728007 PIN-HAIR 3/4” X 1-1/16” 3506 TONGUE CYL ASSY-TELESCOP 730037 GROMMET-RUBBER 7/8” ID 4100...
  • Page 9 RG74DXH Parts Manual Travel Block Assembly 5172 ITEM QTY. PART # DESCRIPTION 5410-20 SHIM TRAVEL BLOCK 5237 TRAVEL BLOCK UHMW 750383 BOLT-SHCS 3/8-16 X 1” SS 800.392.2686...

  • Page 10: Washer Flat

    RG74DXH Parts Manual Hitch Assembly 3504 ITEM QTY. PART # DESCRIPTION 726501 WASHER FLAT 1/2 3505 HITCH WELDMENT 2 5/16 724501 NUT HEX 1/2-13 GR8 728028 PIN-SAFETY SNAP 1/4 X 2 1/2 726502 WASHER LOCK 1/2 722506 BOLT HEX 1/2 - 13 X 2 GR8...
  • Page 11 RG74DXH Parts Manual Tongue Cylinder Assembly Telescope 3506 ITEM QTY. PART # DESCRIPTION 728004 PIN-COTTER 3/16 X 1-1/2 2719 CYLINDER WELD-TONGUE 728007 PIN-HAIR 3/4” X 1-1/16” 2235 PIN, CYL. , TONGUE 761288 HOOK-SLIP W/LATCH 3/8” 3501 PIN, TONGUE LOCK 800.392.2686...
  • Page 12 RG74DXH Parts Manual RH Fender Assembly 3515-01 Rev A. ITEM QTY. PART # DESCRIPTION 724501 NUT HEX 1/2-13 GR8 3516-01 WELDMENT FENDER RH 120 726502 WASHER LOCK 1/2 1884-01 LIGHT BOX BRKT RH 72D 730100 GROMMET-RUBBER 9/16” ID 722110 BOLT WHIZ 1/4-20 X 3/4...
  • Page 13 RG74DXH Parts Manual LH Fender Assembly 3515-02 Rev A. ITEM QTY. PART # DESCRIPTION 724501 NUT HEX 1/2-13 GR8 3516-02 WELDMENT FENDER LH 120 726502 WASHER LOCK 1/2 1884-02 LIGHT BOX BRKT LH 72D 730100 GROMMET-RUBBER 9/16” ID 722110 BOLT WHIZ 1/4-20 X 3/4 730103 ELBOW-FLEX 3/8 90 DEGREE 722539 BOLT CARR 1/2”-13 X 1-1/2...
  • Page 14 RG74DXH Parts Manual Tongue Lift Cylinder Assembly 3713 ITEM QTY. PART # DESCRIPTION 728007 PIN-HAIR 3/4” X 1-1/16” RETRACTED CYLINDER-2 X 12 728012-HAIRPIN HAIR PIN 2721 LUG - CYLINDER 3-7/8 728012-PIN CYLINDER PIN 3501 PIN, TONGUE LOCK...
  • Page 15 RG74DXH Parts Manual Axle Assembly 37485 Rev A 90° 1.388 7.398 3.695 SECTION A-A ITEM QTY. PART # DESCRIPTION 2033 GUARD, SEAL RING-CLAMPING LUG 802570 AXLE-TORFLEX #12 800918 WHEEL/AXLE 765277 WHEEL/TIRE ASSY BAL 800.392.2686...
  • Page 16 RG74DXH Parts Manual Deck Plate Assembly 6898 Rev A. ITEM QTY. PART # DESCRIPTION 2690 BRACKET,CURTAIN LH 5045W DECK PLATE LH WELD 722114 BOLT WHIZ 3/8-16 X 3/4 GR8.2 ZP 5046W DECK PLATE RH WELD 12422 DECK PLATE COVER 2689...
  • Page 17 CUT RUBBER PAD TO 8.625" X 13" ITEM QTY. PART # DESCRIPTION 730025 CLAMP-VINYL COVERED 1” 722307 BOLT-HEX 3/8-16 X 2 37495 BATTERY BOX WELD RG74DXH 803487 WASHER-FENDER 3/8” X 1.5” 37498 BATTERY COVER WELD 760261 NUT-HNNL 3/8-16 INS 37501 ECU MOUNT...
  • Page 18 RG74DXH Parts Manual LH Swing Cylinder Assembly 3715-02 Rev A. ITEM QTY. PART # DESCRIPTION 722201 BOLT HEX 5/16-18 X 2 GR8 3514-02 WELDMENT CYL-SWING LH 730085 ZERK-GREASE 1/4-28 90DEG 2215 PIN, CYLINDER SWING 750050 NUT LOCK 5/16-18 NYLON...
  • Page 19 RG74DXH Parts Manual RH Swing Cylinder Assembly 3715-01 Rev A. ITEM QTY. PART # DESCRIPTION 722201 BOLT HEX 5/16-18 X 2 GR8 3514-01 WELDMENT CYL-SWING RH 750050 NUT LOCK 5/16-18 NYLON 2215 PIN, CYLINDER SWING 730085 ZERK-GREASE 1/4-28 90DEG 800.392.2686...
  • Page 20 RG74DXH Parts Manual Battery Assembly 36304 Rev A. NOTE BATTERY ORIENTATION: DO NOT CLAMP ACROSS VENT CAP! 20 AMP FUSE KEY SWITCH 12 AWG WIRE CONNECTS TO 20 AMP FUSE ITEM QTY. PART # DESCRIPTION 36084 J-HOOK, BATT TIE DOWN...
  • Page 21 RG74DXH Parts Manual King Pin Asm 5174 ITEM QTY. PART # DESCRIPTION 722114 BOLT WHIZ 3/8-16 X 3/4 GR8.2 ZP 4997 PIN, KING 750519 BEARING-SPHERICAL PLAIN 2” 4995 PLATE LOCK PRELOAD NUT 750520 WASHER-THRUST 4996 NUT-PRELOAD 800.392.2686...
  • Page 22 RG74DXH Parts Manual Lift Cylinder Assembly 5182 Rev A. ITEM QTY. PART # DESCRIPTION 750516 BEARING GARMAX 1.5 X 1.25 5034 CYLINDER WELDMENT-LIFT 722308 BOLT-HEX 3/8-16 X 2-1/4 5004 PIN-LIFT CYLINDER SBOOM 722311 BOLT-HEX 3/8-16 X 3 GR8 5028 PIN-LIFT CYLINDER LBOOM...
  • Page 23 3535 CW FENDER ASSEMBLY 726502 WASHER LOCK 1/2 37512 POLYCHAIN COVER ASSEMBLY 724501 NUT HEX 1/2-13 GR8 32395 GUARD WEAR PLATE 722505 BOLT HEX 1/2-13 x 1 3/4 37522 CUTTER WHEEL ASSY. RG74DXH 37956 CUTTER WHEEL MOTOR ASM 37521 LICENSE PLATE BRACKET 800.392.2686...
  • Page 24 RG74DXH Parts Manual Yoke Rod Assembly, Hydraulic Motor 2900 Rev B. " TOUCH-UP PAINT EXPOSED ENDS OF THREADED ROD (@ FINAL ASSEMBLY) ITEM QTY. PART # DESCRIPTION 728018 CLEVIS-1/2 PIN - 5/8-18 2534-01 5/8-18 THREAD ROD X6-1/2 765207 JAM NUT - 5/8” - 18...
  • Page 25 RG74DXH Parts Manual Guard Assembly Rear Chip 3535 ITEM QTY. PART # DESCRIPTION 726301 WASHER FLAT 3/8 USS 3323 REAR CHIP GUARD WELD 726302 WASHER-LOCK 3/8 3236 ROD HINGE, TRAILER RAMP 722303 BOLT-HEX 3/8-16 X 1 728003 COTTER PIN, 5/32 X 1...
  • Page 26 PART # DESCRIPTION 722114 BOLT WHIZ 3/8-16 X 3/4 GR8.2 ZP 722516 BOLT HEX 1/2-13 X 4.75GR8 21539 BOTTOM CAP WELD 722509 BOLT HEX 1/2-13 X 3 GR8 21540 COVER 724503 NUT-HNML 1/2-13 PREV TORQ GR8 37513 BELT COVER WELD RG74DXH...
  • Page 27 RG74DXH Parts Manual Cutter Wheel Motor Assembly 37956 Rev A. TORQUE (1) BOLT TO 80 lbf/ft. 10 11 NOTE: USE MANUFACTURERS INSTALLATION INSTRUCTIONS WHEN INSTALLING 804901 TORQUE (8) BOLTS TO 73 lbf/ft. TORQUE (4) BOLTS TO 173 lbf/ft. ITEM QTY. PART # DESCRIPTION...
  • Page 28 RG74DXH Parts Manual Cutter Wheel Assembly 37522 Rev B. 24 23 10 11 10 11 11 ITEM QTY. PART # DESCRIPTION 726602 WASHER LOCK 9/16 20432T TOOTH, ONE PIECE, TAPPED 4527 CUTTER WHEEL 1 X 28 2933t TOOTH, ONE PIECE, TAPPED...
  • Page 29 RG74DXH Parts Manual Hinge Bearing Assembly 5178 Rev A. ADD ANTI-SEIZE OR EQUIVALENT TO THREADS ITEM QTY. PART # DESCRIPTION 722725 BOLT BHCS 3/8-16 X 3/4 ZP 4949 PIN, HINGE 726302 WASHER-LOCK 3/8 5035 CAP HINGE PIN 730011 ZERK-GREASE 1/4-28 STR...
  • Page 30 RG74DXH Parts Manual SOA Assembly 37531 Rev B 26 27 29 41 42 DETAIL B SCALE 1 : 2...
  • Page 31 PIN-ROLL 1/8 X 1 HARDENED 724107 SCREW-#6-32 X 1 HH 760169 RING-RETAIN EXT 2” 761599 NUT-HNNL #6-32 3936 SHIELD-OPERATOR, SOA 37533 SOA ARM STOP WELD RG74DXH 3255 COVER 3 BANK VALVE SOA 37532 SOA SWITCH BRACKET 730038 STRAP-TARP W/S-HOOK 10” 800344 SWITCH-LIMIT-BOOTED 720615- 22 93.6IN...
  • Page 32 750399 BOLT WHIZ 3/8-16 X 1” GR8.2 ZP 805123 FILTER- HYD 1-1/4” 763538 PLUG- DRAIN,MAG 1/2 NPT 27439 SENSOR, HYD OIL LEVEL W/PLUG 37535 TANK,WELDMENT FUEL RG74DXH 804895 FILTER-FUEL ASM WITH PRIMER 37542 TANK,WELDMENT HYD RG74DXH 805378 GAUGE-FUEL 15” 738983 GAUGE-SIGHT, TEMPERATURE...
  • Page 33 RG74DXH Parts Manual 800.392.2686...
  • Page 34 RG74DXH Parts Manual Engine Assembly 37548 Rev H INSERT 805746 O-RING-AIR INTAKE SEAL TORQUE TO 40 FT/LBS WITH BLUE LOCTITE INSERT 805747 O-RING-HOT AIR CHARGED SEAL TORQUE TO 70 FT/LBS WITH BLUE LOCTITE TORQUE TO 70 FT-LBS WITH BLUE LOCTITE...
  • Page 35 RG74DXH Parts Manual Engine Assembly 37548 Rev H ITEM QTY. PART # DESCRIPTION 804887 ENGINE-CUMMINS 3.8L 74HP 803603 SPACER- FAN 3" QSF3.8 803650 FIT - 10MJ-18MMOR 804653 FAN-ENG-PULLER RG74T-R 36129 BRACKET, DOC WELDMENT MOUNT-ISO KIT 45 DURO 804908 PUMP-CW 80CC...
  • Page 36 802322 NUT-WNNL 3/8-16 ZP NUT-WHIZ 3/8-16 SERR FLANGE L/N 37550 TOP HOOD 750061 GR8 ZN 37553 PANEL, FRONT HOOD WELD RG74DXH 722330 BOLT CAR 3/8-16 X 3/4 36134 AIR CLEANER ASM 74HP 726300 WASHER FLAT 3/8 SAE 36153 COOLANT BOTTLE COVER...
  • Page 37 RG74DXH Parts Manual Air Cleaner Assembly 36134 CLAMP-CONST. TORQUE 3-3/4 TO ITEM QTY. PART # DESCRIPTION 801915 4-5/8 SLHD 804880 AIR FILTER ASSEMBLY SCREW-SHCS M6X1X20 GR12.9 802235 PLAIN 750028 HUMP-REDUCER 4” X 3” 726950 WASHER METRIC LOCK 6MM 33096 AIRFILTER TO TURBO PIPE 760777 WASHER-FLAT M6 762933 HOSE-SILICONE 3”...
  • Page 38 RG74DXH Parts Manual Radiator Assembly 37576 Rev A. 18 20 25 26 19 21 27 21 NOTES: .CUT 730043 FOR RADIATOR CAP OVERFLOW TO 47.5" .CUT 805171 RADIATOR ELBOW 1.375" OFF OF EACH LEG 17 22 USE 112" WEATHERSTRIP 18 20...
  • Page 39 760794 TRIM-BULB STR 1/8 EDGE, 3/4 SEAL NUT-WHIZ 1/2-13 SERR FLANGE L/N 763297 ISOLATOR, TANK 750057 GR8 ZN 763817 HOSE-SILICONE 2” ID X 4” LG 37577 MOUNT, RADIATOR WELD RG74DXH 765128 BUFFER-50X30 B 3/8X1.1 32 112”B3 12000127 WEATHERSTRIP- 5/32 X 1/2 800.392.2686...
  • Page 40 RG74DXH Parts Manual Shroud, Fan Assembly 36027 Rev B. ITEM QTY. PART # DESCRIPTION 36283 GUARD, FAN LH WELD 36028 SHROUD, FAN WELD 36284 GUARD, FAN RH 750765 BOLT WHIZ 1/4-20 X 1/2 36268 FAN GUARD BRACKET BOTTOM NUT-WHIZ 1/4-20 SERR FLANGE...
  • Page 41 804665 DECAL-DO NOT OPERATE REMOVED GUARDS 30224 DECAL- MADE IN USA 2013 LOGO 804666 DECAL-LIFT POINT 37418 DECAL - IGNITION 804667 DECAL-WARNING ELECTRICAL 37584 DECAL- SOA PANEL RG74DXH HAZARD 804669 DECAL-SKIN PUNCTURE 37626 DECAL-DISPLAY RG74DXH PRESSURIZED 37674 DECAL- RG74DXH OUTLINE 804761 DECAL - TEST SAFETY SWITCH 800.392.2686...
  • Page 42 RG74DXH Parts Manual Main Electrical Wiring Harness 37581 Rev B. 11" 11" 11" 11" 11" 11" LOOM PLUG '24' CW PUMP TYPE 'F' PLUG '31' 6" RUN PWR RELAY TYPE 'T' 5" PLUG '23' 14" HYD TEMP TYPE 'F' 8"...
  • Page 43 RG74DXH Parts Manual Main Electrical Wiring Harness 37581 Rev B. CUTTER 1" 4" 4" 4" 4" 2" 2" WHEEL ON/OFF 8" TYPE 'X' CUTTER 1" WHEEL 8" ON/OFF TYPE 'X' LCOKOUT LOCKOUT 6" PLUG '43' PLUG '38' TYPE 'S' TYPE 'S'...
  • Page 44 RG74DXH Parts Manual Main Electrical Wiring Harness 37581 Rev B.
  • Page 45 RG74DXH Parts Manual Main Electrical Wiring Harness 37581 Rev B. COLOR LEGEND: RED = RED BLK = BLACK BRN = BROWN ORG = ORANGE YLW = YELLOW TAN = TAN PUR = PURPLE GRN = GREEN BLU = BLUE GRY = GRAY...

  • Page 46: Wire Description

    RG74DXH Parts Manual Main Electrical Wiring Harness 37581 Rev B. FROM WIRE DESCRIPTION GAUGE COLOR PLUG# PIN# (FUNCTION IMPRINT) PLUG# PIN # COM GND CAN (+) 18 *TWISTED CAN (-) 18 *TWISTED SERIAL GND HYD OIL LEVEL SWITCH STARTER LOCKOUT SIG...
  • Page 47 RG74DXH Parts Manual Main Electrical Wiring Harness 37581 Rev B. COOLANT LVL INPUT ECU GROUND ECU GROUND ECU GROUND ECU GROUND ECM RETURN ECU GROUND INTAKE HEAT RELAY SIG HS RETURN STARTER LOCKOUT SIG ECU GROUND BAT/ENG BLOCK GND START SOL SIG...
  • Page 48 RG74DXH Parts Manual Harness-Can J1939 Kit 37801 PLUG '01' PLUG '02' 8" CAN-BUS CAN-BUS (DIAGNOSTIC) (DISPLAY) TYPE 'B' TYPE 'B' 37801-01 PLUG '01' PLUG '02' 69" CAN-BUS CAN-BUS (DIAGNOSTIC) (ECU) TYPE 'A' TYPE 'B' 37801-02 Terminal Legend A - DEUTSCH DT06-3S-CE04 (W/ W3S-1939-P012 WEDGE & GOLD PLATED SOCKETS) B - DEUTSCH DT06-3S-CE04 (W/ W3S-P012 WEDGE &...
  • Page 49 RG74DXH Parts Manual Battery Cable Kit 37801 50" 00AWG RED 3" 6 AWG RED ONE TERMINAL END IS PERPENDICULAR TO THE OTHER STARTER+. BATTERY POST 200A FUSE PREHEAT SOL. TYPE 'C' & 'E' POS. TYPE 'C' TYPE 'B' &'G' 37812-01 TYPE 'D' &...
  • Page 50 DESCRIPTION 804909 CW MOTOR MANIFOLD 760759 VALVE-CHECK 15 PSI 804908 CUTTER WHEEL PUMP 805309 FIT-08 MORFS X -08 MOR R.125 805215 PUMP- GEAR 8CC RG74DXH 801012 VALVE-CHECK 25 PSI 738004 VALVE-3 SPOOL RG50/66/90 738046 FILTER-HEAD LARGE 738008 VALVE-SWING CONTROL 805123 FILTER- HYD 1-1/4”...
  • Page 51 RG74DXH Parts Manual Hydraulic Kit Schematic 805387 800.392.2686...
  • Page 52 RG74DXH Parts Manual Adapter Kit 805387A Rev C. ITEM PART # DESCRIPTION FF6400-06-06 06 MORFS X 06 MORB STRAIGHT FF6600-06-06-06 06 MORFS X 06 MORFS X 06 FORFS BRANCH TEE FF6801-06-06 06 MORFS X 06 MORB ELBOW FF2501-06-04 06 MORFS X 04 MP ELBOW...
  • Page 53 RG74DXH Parts Manual Hose Kit 805387H Rev C ITEM PART # DESCRIPTION 8R17-8FSX-8FFSX90LONG-110” 4R17-4FSX-4FSX90-53” 4R17-4FSX-4FSX90-104” 4R17-4FSX-4FSX90-152” 4R17-4FSX-4FSX90-146” 4R17-6FSX-4FSX90-142” 4R17-4FSX-6FSX-14” 4R17-4FSX-4FSX-18” 6R16-6FSX-6FSX-23” 6R16-6FSX-6FSX-35” 6R16-6FSX-6FSX-47” 8R16-8FSX-8FSX90-12” 12R4-PLAIN-18” 12R4-PLAIN-78” W/NHS 12R4-PLAIN-60” W/NHS EATON 5/8” EH22510 BLUE HEATER HOSE OR EQUIVILENT-43” EATON 3/8” EH22506 BLUE HEATER HOSE OR EQUIVILENT-25”...

  • Page 54: Service Parts

    RG74DXH Parts Manual Service Parts ENGINE OIL FILTER - 804903 FUEL FILTER ASSEMBLY PRIMARY FUEL FILTER - 804905 SECONDARY FUEL FILTER - 804904 CUTTER PUMP CHARGE FILTER ELEMENT - 805075 RESTRICTION INDICATOR - 805153 HYDRAULIC TANK FILTER ELEMENT - 805123...
  • Page 55 Belts will be covered under warranty only if Rayco on any Rayco product are those set forth on this page. In receives warranty from their supplier. no event will the dealer and or Rayco be liable for incidental or consequential damages, including but not limited to: b.
  • Page 56 We care about your safety. When operating your RAYCO® machinery always wear an ap- proved helmet complete with ear muffs, face shield and the proper eye wear. Never operate under the influence of alcohol or drugs. Know your RAYCO, read and understand your owner’s manual cover to cover.