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Hiniker DB1474A Service Manual

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HINIKER V-PLOW
HYDRAULIC UNIT
DB1474A
SERVICE MANUAL
DO NOT USE OR OPERATE THIS EQUIPMENT UNTIL THIS MANUAL
HAS BEEN READ AND THOROUGHLY UNDERSTOOD
PART NUMBER 25010926 Rev. A

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Cole
February 16, 2025

Controller is lit up green like plow should be working but when I go to do any function with the plow it won't work. Controller makes a buzzing noise. Sometimes it does this and other times plow works great with no issues

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Summary of Contents for Hiniker DB1474A

  • Page 1 HINIKER V-PLOW HYDRAULIC UNIT DB1474A SERVICE MANUAL DO NOT USE OR OPERATE THIS EQUIPMENT UNTIL THIS MANUAL HAS BEEN READ AND THOROUGHLY UNDERSTOOD PART NUMBER 25010926 Rev. A...
  • Page 3 Introduction POWER UNIT OPERATION TITLE GENERAL ANGLE LEFT MODE OF OPERATION The hydraulic power unit consists of a 12 VDC Operating the Angle Left switch energizes the 12 motor, a hydraulic pump rated at 1.9 GPM @ VDC motor, the S5 solenoid valve and the S2 solenoid valve.
  • Page 4 Introduction VEE MODE OF OPERATION Operating the Vee switch energizes the S2 sole- noid valve and the S6 solenoid valve. An exten- sion spring on the moldboard forces hydraulic fluid, not under pressure, from the left wing cyl- inder through the S2 solenoid valve back to the reservoir as the cylinder retracts.
  • Page 5 Power Unit - Hydraulic POWER UNIT - V PLOW TITLE DWG NO. 5457...
  • Page 6 Power Unit - Component Location POWER UNIT - COMPONENT LOCATION TITLE DWG NO. 4213 25011062 Power Unit REF. PART REF. PART DESCRIPTION QTY. DESCRIPTION QTY. NUMBER NUMBER 25010230 DC Motor 12 V 25010745 Return Tube Filter 25010214 Coupling 25010746 Check Valve 25010235 Pin 1/8 x 1/4 25011065...
  • Page 7 Power Unit - Hydraulic POWER UNIT - V PLOW TITLE VIEW A-A VIEW B-B SYSRV DWG NO. 3711...
  • Page 8 Power Unit - Component Location POWER UNIT - COMPONENT LOCATION TITLE 20 (14,32,33) 20 (14,32,33) (14,32,33) (14,32,33) 20 (14,32,33) 25010732 Power Unit DWG NO. 3708 REF. PART REF. PART DESCRIPTION QTY. DESCRIPTION QTY. NUMBER NUMBER 25010230 DC Motor 12V 25010745 Return Tube Filter 25010214 Coupling...
  • Page 9 Power Unit - Hydraulic Circuit Diagram POWER UNIT - HYDRAULIC CIRCUIT DIAGRAM TITLE DWG NO. 4182A...

  • Page 11: Table Of Contents

    Table of Contents 1 TABLE OF CONTENTS TITLE 25010926 Rev. A 3/05 Manual/25010926RevA Troubleshooting Procedures ....................... 2 V-Plow Will Not Raise ........................3 V-Plow Lifts Slowly ........................4 V-Plow Will Not Stay Up ......................5 V-Plow Will Not Lower ......................... 6 Left Wing Will Not Extend ......................

  • Page 12: Troubleshooting Procedures

    Check all hoses and cylinders for proper condition and leaks. This section is designed to help you troubleshoot the hydraulic system on the Hiniker V-Plow. Make sure battery is charged and charging system is in good condition. Each procedure consists of a detailed problem...

  • Page 13: V-Plow Will Not Raise

    RAISE switch on the joystick con- trol box to ensure that the FLOAT mode is OFF. Check S4 Solenoid Valve for magne- Call Hiniker Service Does V-Plow Raise? tism by loosely holding metal end of screw- driver within 1/8” of the nut end of the S4 Solenoid Valve Coil.

  • Page 14: V-Plow Lifts Slowly

    Remove, lift cylinder and drain oil. Check for a binding cylinder by manu- ally compressing and extending the cylin- der. Repair or replace as necessary. Does V-Plow lift fully up in approximately 2 sec- onds? DWG NO. 3066 Call Hiniker Service...

  • Page 15: V-Plow Will Not Stay Up

    S4 Solenoid Valve, using a voltmeter or test light. Is voltage present? Refer to electrical troubleshooting. Does V-Plow say up? Remove, inspect and clean S4 Solenoid Valve. See page 20. Repair or replace as necessary. Does V-Plow stay up? Call Hiniker Service...

  • Page 16: V-Plow Will Not Lower

    Support plow blade (same as the left paragraph). Check for plugged fittings and hydraulic hose. Remove and drain oil from lift cylinder. Check for frozen/binding cylinder by manually compressing and extending the cylinder. Repair or replace as necessary. Does V-Plow lower? Call Hiniker Service...

  • Page 17: Left Wing Will Not Extend

    1 (RV1). Repair or replace as necessary. See page 16 or 18. Reinstall and adjust. See page 31 or 36. Does Left Wing Extend? Call Hiniker Service Remove, inspect and clean S2 Solenoid Valve. Repair or replace as necessary. See page 20. Does Left Wing Extend?

  • Page 18: Right Wing Will Not Extend

    2 (RV2). Repair or replace as necessary. See page 16 or 19. Reinstall and adjust. See page 31 or 36. Does Right Wing Extend? Call Hiniker Service Remove, inspect and clean S6 Solenoid Valve. Repair or replace as necessary. See page 20. Does Right Wing Extend?

  • Page 19: Left Wing Will Not Stay Extended

    Repair or replace as necessary. Does Left Wing Stay Extended? Remove, inspect and clean Relief Valve 1 (RV1). See page 18. Repair or replace as necessary. Reinstall and adjust. See page 31. Does Left Wing Stay Extended? Call Hiniker Service...

  • Page 20: Right Wing Will Not Stay Extended

    Repair or replace as necessary. Does Right Wing Stay Extended? Remove, inspect and clean Relief Valve 2 (RV2). See page 19. Repair or replace as necessary. Reinstall and adjust. See page 31. Does Right Wing Stay Extended? Call Hiniker Service...

  • Page 21: Left Wing Will Not Retract

    Check left wing cylinder hose and fit- tings for obstructions. Remove left wing cylinder from plow and drain oil. Check for frozen/binding cylinder by manually compressing and extending the cylinder. Repair or replace as necessary. Does Left Wing Retract? Call Hiniker Service...

  • Page 22: Right Wing Will Not Retract

    Check left wing cylinder hose and fit- tings for obstructions. Remove left wing cylinder from plow and drain oil. Check for frozen/binding cylinder by manually compressing and extending the cylinder. Repair or replace as necessary. Does Right Wing Retract? Call Hiniker Service...

  • Page 23: Dc Motor Removal And Replacement

    DC Motor Removal and Replacement 13 DC MOTOR REMOVAL AND REPLACEMENT TITLE WARNING: Disconnect Vehicle Battery NOTE: Use care when removing the motor from prior to performing this procedure to the endhead, the motor can separate into three avoid electrical shock or burns. pieces and will require additional time to reas- semble.

  • Page 24: Dc Motor Brush Removal And Replacement

    14 DC Motor Brush Removal and Replacement DC MOTOR BRUSH REMOVAL AND REPLACEMENT TITLE WARNING: Disconnect Vehicle Battery NOTE: If your motor is equipped with two (2) prior to performing this procedure to brushes with bare wires (Ground brushes) and avoid electrical shock or burns.

  • Page 25: Check Valve Removal, Cleaning & Replacement (Cv1, Cv2, Cv3)

    Check Valve Removal, Cleaning and Replacement 15 CHECK VALVE REMOVAL, CLEANING & TITLE REPLACEMENT (CV1, CV2, & CV3) WARNING: Always retract wings fully, Inspect the check valve O-rings for wear and lower the plow to the ground and re- contamination. Replace O-rings if necessary. lieve pressure before removing any (P/N 25010992).

  • Page 26: 16 Relief Valve Removal, Cleaning & Replacement

    16 Relief Valve Removal, Cleaning & Replacement RELIEF VALVE TITLE REMOVAL, CLEANING AND REPLACEMENT WARNING: Always retract wings fully, Install spring alignment spacer. Use caution to in- lower the plow to the ground and re- stall with alignment stem into spring. lieve pressure before removing any fittings, hoses or caps.

  • Page 27: System Relief Valve Removal, Cleaning & Replacement

    System Relief Valve Removal, Cleaning & Repacement 17 SYSTEM RELIEF VALVE TITLE REMOVAL,CLEANING AND REPLACEMENT WARNING: Always retract wings fully, lower the plow to the ground and re- lieve pressure before removing any fittings, hoses or caps. Allow the system to BALL ADJ.

  • Page 28: Relief Valve 1 (Rv1) Removal, Cleaning & Replacement

    18 Relief Valve 1 (RV1) Replacement RELIEF VALVE 1 (RV1) TITLE REMOVAL, CLEANING AND REPLACEMENT WARNING: Always retract wings fully, lower the plow to the ground and re- lieve pressure before removing any fittings, hoses or caps. Allow the system to cool down before draining oil or handling system components.

  • Page 29: Relief Valve 2 (Rv2) Removal, Cleaning & Replacement

    RV2 Relief Valve Replacement 19 RELIEF VALVE 2 (RV2) TITLE REMOVAL, CLEANING AND REPLACEMENT WARNING: Always retract wings fully, lower the plow to the ground and re- lieve pressure before removing any fittings, hoses or caps. Allow the system to BALL ADJ.

  • Page 30: Solenoid Valve Removal, Cleaning And Replacement

    20 Solenoid Valve Replacement SOLENOID VALVE REMOVAL, TITLE CLEANING AND REPLACEMENT WARNING: Disconnect Vehicle Battery prior to performing this procedure to avoid electrical shock or burns. WARNING: Always retract wings fully, lower the plow to the ground and re- lieve pressure before removing any fittings, hoses or caps.
  • Page 31 Solenoid Valve Replacement 21 Clean screen by soaking cartridge valve in sol- vent and inspect end head and/or valve block cavity with a pencil magnet for contamination. Flush out end head and/or valve block cavity with clean hydraulic oil. Re-install the valve cartridge into end head or valve block and tighten down to 10-15 ft.

  • Page 32: Valve Block Removal, Cleaning And Replacement

    22 Valve Block Removal and Replacement VALVE BLOCK TITLE REMOVAL, CLEANING AND REPLACEMENT WARNING: Always retract wings fully, lower the plow to the ground and re- lieve pressure before removing any fittings, hoses or caps. Allow the system to cool down before draining oil or handling system components.

  • Page 33: Hydraulic Pump Removal, Cleaning And Replacement

    Hydraulic Pump Replacement 23 HYDRAULIC PUMP TITLE REMOVAL, CLEANING AND REPLACEMENT Remove return line filter by pulling it straight off WARNING: Always retract wings fully, the return tube. The filter should be replaced lower the plow to the ground and re- with a new one (P/N 25010745).
  • Page 34 24 Hydraulic Pump Replacement Turn Pump Input Shaft by hand and visually in- spect gear teeth through inlet port. Pump should rotate smoothly and no teeth should be missing or damaged. Replace entire Pump if damaged or if Pump turns hard. COUPLING ENDHEAD PHOTO NO.
  • Page 35 Hydraulic Pump Replacement 25 PHOTO NO. 9007A PHOTO NO. 9023 Re-install the suction cover to the pump and Inspect the reservoir O-ring for damage, replace torque the two bolts to 4-6 ft. lbs. Start the sin- if necessary (P/N 25010236). gle bolt by hand and torque to 13-15 ft.

  • Page 36: Flow Control Valve Removal, Cleaning And Replacement

    26 Flow Control Valve Replacement FLOW CONTROL VALVE TITLE REMOVAL, CLEANING AND REPLACEMENT WARNING: Disconnect Vehicle Battery prior to performing this procedure to avoid electrical shock or burns. WARNING: Always retract wings fully, lower the plow to the ground and re- lieve pressure before removing any fittings, hoses or caps.
  • Page 37 Flow Control Valve Replacement 27 Re-install flow control valve into valve block. Re-install the valve cartridge into valve block and tighten down to 10-15 ft. lbs. Torque with 7/8” deep well socket. CAUTION: DO NOT overtighten the coil nut. The coil and shaft can be eas- ily damaged requiring replacement.

  • Page 38: 28 Hydraulic Pump Test

    28 Hydraulic Pump Test TITLE HYDRAULIC PUMP TEST Remove the hydraulic fitting located on the front- WARNING: Always retract wings fully, lower the plow to the ground and re- side of the valve block. Port is marked “L.” lieve pressure before removing any fittings, hoses or caps.

  • Page 39: System Relief Valve Testing And Adjustment 29

    System Relief Valve Testing and Adjustment 29 SYSTEM RELIEF VALVE TITLE TESTING AND ADJUSTMENT Using the proper fittings, install a pressure gauge WARNING: Always retract wings fully, lower the plow to the ground and re- as shown. lieve pressure before removing any fittings, hoses or caps.
  • Page 40 30 System Relief Valve Testing and Adjustment NOTE: If no increase in pressure is observed after turning the adjustment screw clockwise, either the pump is weak (see “Hydraulic Pump Test” page 28), the valve has dirt between the valve ball and seat, or the spring is weak or bro- ken.

  • Page 41: Relief Valve Testing And Adjustment

    Relief Valve Testing and Adjustment 31 TITLE RELIEF VALVE TESTING AND ADJUSTMENT relief valve 2 (RV2). See photo 4127C for the WARNING: Always retract wings fully, lower the plow to the ground and re- relief valve locations. lieve pressure before removing any fittings, hoses or caps.
  • Page 42 Relief Valve Testing and Adjustment NOTE: If no increase in pressure is observed after turning the adjustment screw clockwise, either the pump is weak (see “Hydraulic Pump Test,” page 27), the valve has dirt between the valve ball and seat, or the spring is weak or bro- ken.

  • Page 43: Dc Motor Current Draw (Full Load)

    DC Motor Current Draw (Full Load) 33 TITLE DC MOTOR CURRENT DRAW (FULL LOAD) Equipment: Inductive Pickup Amp Meter Park vehicle in an area with adequate ventilation and with enough room to safely, raise the plow. WARNING: This test is extremely dan- gerous and should not be attempted by Install an Inductive Pickup Amp Meter around anyone that is not familiar with testing...

  • Page 44: Dc Motor Current Draw (No Load)

    34 DC Motor Current Draw (No Load) TITLE DC MOTOR CURRENT DRAW (NO LOAD) Equipment: Inductive Pickup Amp Meter This test is extremely dangerous and MOTOR AMP METER POWER should not be attempted by anyone BATTERY that is not familiar with testing electri- POSITIVE TERMINAL cal components capable of High Amp Draw!

  • Page 45: Solenoid Valve Test 35

    Solenoid Valve Test 35 TITLE SOLENOID VALVE TEST WARNING: This procedure requires TEST PROCEDURE the plow to be operated. Stand clear of plow during operation. FAILURE TO Hold the metal end of a screwdriver about HEED THIS WARNING CAN RESULT IN SERI- 1/8”...

  • Page 46: Relief Valve Testing And Adjustment

    36 Relief Valve Testing and Adjustment TITLE RELIEF VALVE TESTING AND ADJUSTMENT WARNING: Always retract wings fully, Start the vehicle. Activate and hold the Raise lower the plow to the ground and re- switch on joystick control box. Record the pres- lieve pressure before removing any fit- sure reading.
  • Page 47 Relief Valve Testing and Adjustment 37 Using the proper fittings, install a 0-3000 PSI PROCEDURE FOR RV1 & RV2 gauge as shown. TEST CONDITIONS Start the vehicle and raise the plow slightly. WARNING: Vehicle engine must be While holding the joystick in the SCOOP posi- running for this procedure.

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