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Summary of Contents for Muncie HP022451-21
- Page 1 READ OPERATING INSTRUCTIONS INSIDE BEFORE OPERATING PTO HP022451-21 INSTALLATION AND OPERATOR’S MANUAL F E AT U R E S • I N S TA L L AT I O N • S E R V I C E Muncie Power Products, Inc.
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Page 3: Table Of Contents
Table of Contents DESCRIPTION PAGE Valve Features & Specifications ..............4 Hydraulic Work Ports .................. 5 Cartridge, Designations, and Part Numbers ..........6 Schematic ....................8 Relief Valve Adjustment ................9 Manual Override Instructions ..............11 Converting Manifold (Open-Center to Closed-Center ......12 Troubleshooting .................. -
Page 4: Valve Features & Specifications
FEATURES • Cartridge valve manifold assembly configurable for open or closed center operation. • Compensated load sense design provides stable flow control during pressure fluctuations. • Pressure relief redundancy for maximum system protection. • All valve coils are configured for 12 VDC continuous duty operation. Valve coils are of proportional design. -
Page 5: Hydraulic Workports
HYDRAULIC WORKPORTS HP022451-21 DESIGNATION DESCRIPTION SIZE (SAE) PLOW LEFT PLOW RIGHT PLOW UP PLOW DOWN HOIST UP HOIST DOWN LOAD SENSE AUGER TANK SPINNER PUMP... -
Page 6: Cartridge, Designations, And Part Numbers
CARTRIDGE, DESIGNATIONS, PART NUMBERS DESIGNATION FUNCTION PART NUMBER CV3, CV4 SPREADER LS CHECKS NXCV08-20-0-N-04 UNLOADING COMPENSATOR NXEV16-S34-0-N-10 LOAD SENSE DRAIN NXFR08-20F-0-N/0.2 SPREADER RELIEF NXRV10-22A-0-N-35/20 HOIST RAISE FLOW CONTROL NXSP12-20-M-0-N-12ER DOWNSIDE PRESSURE CONTROL NXTS10-36C-0-N-12ER... - Page 7 CARTRIDGE, DESIGNATIONS, PART NUMBERS DESIGNATION FUNCTION PART NUMBER CBV5 PLOW COUNTERBALANCE NXCBCALHN PROV CROSS RELIEF CAVITY NXCP10-20-N PROV SA PLOW CAVITY NXCP08-20-N HOIST LOAD HOLD CHECK NXCV10-20-0-N-05 SPREADER LS CHECK NXCV08-20-0-N-04 CV2, CV5 HOIST LS CHECK NXCV08-20-0-N-04 SPINNER COMPENSATOR NXEC12-32-0-N-80 AUGER COMPENSATOR NXEC12-32-0-N-80 CLIPPER RELIEF...
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Page 8: Schematic
HYDRAULIC SCHEMATIC... -
Page 9: Relief Valve Adjustment
RELIEF VALVE ADJUSTMENT RV1 Clipper Relief Adjustment (Factory Setting 2750 PSI) 1. View the pump gauge while making this pressure relief adjustment. 2. Loosen the lock nut on the relief cartridge while holding the Allen screw stationary. 3. Start the truck and deadhead flow for the plow raise to generate full system pressure. - Page 10 RELIEF VALVE ADJUSTMENT RV2 – Boost Relief Adjustment (Factory Setting 250 PSI) 1. While adjusting, monitor the pump pressure gauge. 2. To view boost pressure setting - manually engage the TS2 valve by turning the small hex adjustment on the valve stem CW. Once adjusted, the pump gauge should display the current boost pressure setting.
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Page 11: Manual Override Instructions
MANUAL OVERRIDE FUNCTION VALVE SEQUENCE MANUAL OVERRIDE INSTRUCTION TS2 – Turn hex adjustment CW PLOW RAISE/LOWER TS2 + SP4 SP4 - Push pink override DN to raise plow Pull pink override UP to lower plow TS2 – Turn hex adjustment CW HOIST RAISE TS2 + SP5 SP5 –... -
Page 12: Converting Manifold
CONVERTING MANIFOLD TO CLOSED CENTER Step 1 - Locate the (RV2) boost pressure relief cartridge Step 2 - Remove the cartridge and replace with blocking cavity plug (CP08-20-N) Step 3 – Reference controller calibration manual to place controls in “piston pump”... -
Page 13: Troubleshooting
TROUBLESHOOTING CAUTION- ONLY REMOVE COMPONENTS WHEN PUMP IS OFF AND SYSTEM IS NOT UNDER PRESSURE SYMPTOMS POSSIBLE CAUSE & SOLUTION No Hydraulic Operation • Remove cartridges from unloading circuit (EV1, RV2, and TS2) and check for debris/contamination. • Remove the (RV1) clipper main relief for contamination. •... - Page 14 TROUBLESHOOTING CAUTION- ONLY REMOVE COMPONENTS WHEN PUMP IS OFF AND SYSTEM IS NOT UNDER PRESSURE SYMPTOMS POSSIBLE CAUSE & SOLUTION The plow will not lower • Reduce (CBV5) counterbalance setting. • Check RV4 downside pressure setting. If too low, pilot pressure will be unable to unlock CBV5 counterbalance load holding valve.
- Page 15 NOTES...
- Page 16 201 East Jackson Street, Muncie, Indiana 47305 800-367-7867 Fax: 765-284-6991 • info@munciepower.com Specifications are subject to change without notice. Visit www.munciepower.com for warranties and literature. A Member of the Interpump Group All rights reserved. © Muncie Power Products, Inc. (2025) IN25-09 (Rev. 06-25)
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