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BLACKMER GNXH2A - User Manual

BLACKMER GNXH2A
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BLACKMER POWER PUMPS
961224
INSTRUCTIONS NO. 101-C00
INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS
MODELS: GNX(H)2A, GNX(H)2.5A, GNX(H)3A, GNX(H)4A
Section
Effective
Replaces
101
Mar 2019
Oct 2018
TABLE OF CONTENTS Page
PUMP DAT
A
Technical Data .................................................... 2
Initial Pump Start Up Information ........................ 2
INSTALLATION
Pre-Installation Cleaning ..................................... 3
Location and Piping ............................................. 3
Mounting ............................................................. 3
Coupling Alignment ............................................. 4
Motor Coupling Installation………………………...4
Gear Reducer Alignment – GNX(H) Models ....... 4
Pump Rotation .................................................... 6
To Change Pump Rotation .................................. 6
Check Valves ...................................................... 6
OPERATION
Pre-Start Up Check List ...................................... 7
Start Up Procedures ............................................ 8
Running the Pump in Reverse Rotation .............. 9
Flushing the Pump .............................................. 9
Pump Relief Valve ............................................... 9
Relief Valve Setting and Adjustment ................... 9
PUMP MAINTENANCE
Pump Lubrication ................................................. 10
Strainers............................................................... 11
Vane Replacement .............................................. 11
Pump Disassembly .............................................. 11
Parts Replacement .............................................. 11
Pump Assembly ................................................... 12
GEAR REDUCER MAINTENANCE ............................ 14
PUMP TROUBLE SHOOTING .................................... 16
GEAR REDUCER TROUBLE SHOOTING ................. 17
NOTE: Numbers in parentheses following individual parts
indicate reference numbers on Blackmer Parts Lists.
Blackmer pump manuals and parts lists may be obtained
from Blackmer's website (www.blackmer.com) or by
contacting Blackmer Customer Service.
PUMP PUMP PARTS LIST
MODEL 2” 2.5” 3” 4”
GNX(H)
101-C01 101-C02 101-C03 101-C04
SAFETY DATA
This is a SAFETY ALERT SYMBOL.
When you see this symbol on the product, or in the
manual, look for one of the following signal words and be
alert to the potential for personal injury, death or major
property damage
Warns of hazards that WILL cause serious personal injury,
death or major property damage.
Warns of hazards that CAN cause serious personal injury,
death or major property damage.
Warns of hazards that CAN cause personal injury
or property damage.
NOTICE:
Indicates special instructions which are very
important and must be followed.
NOTICE:
Blackmer Pumps MUST only be installed in systems, which
have been designed by qualified engineering personnel.
The system MUST conform to all applicable local and
national regulations and safety standards.
This manual is intended to assist in the installation and
operation of the Blackmer power pumps, and MUST be kept
with the pump.
Pump service shall be performed by qualified technicians
ONLY. Service shall conform to all applicable local and
national regulations and safety standards.
Thoroughly review this manual, all instructions and hazard
warnings, BEFORE performing any work on the pump.
Maintain ALL system and pump operation and hazard
warning decals.

Table of Contents

Questions and Answers

  • D
    donna82Aug 9, 2025
    Why is my BLACKMER Power Pump not priming?
    • M
      michael74Aug 9, 2025
      If your BLACKMER Power Pump isn't priming, several factors could be at play. Ensure the pump is wetted. You may need to replace worn vanes. Check that the suction valve is open and inspect the suction line for any air leaks. A clogged strainer could also be the culprit, so clean or replace it. Clear any clogs in the suction line or valves. Address any vapor-lock issues within the pump. Increasing the pump speed during priming might help. Lastly, consider replacing or adjusting the relief valve.
  • B
    bakerdavidAug 14, 2025
    What to do if my BLACKMER Power Pump has reduced capacity?
    • B
      bobby99Aug 14, 2025
      If your BLACKMER Power Pump is experiencing reduced capacity, try the following: increase the pump speed and ensure the suction valves are fully open. Check for air leaks in the suction line and reduce any excessive restriction there. Replace any damaged or worn parts. Reduce any restrictions in the discharge line. Repair or replace the relief valve if needed. Also, verify the correct installation of the vanes.
  • S
    sharonhallAug 25, 2025
    What causes damaged vanes in BLACKMER Power Pump?
    • M
      Mrs. Allison RoblesAug 25, 2025
      Damaged vanes in your BLACKMER Power Pump can be caused by several factors. It's important to prevent foreign objects from entering the pump and avoid running the pump dry. Cavitation should be prevented, and the viscosity should be suitable for the pump speed. Ensure compatibility with the liquids pumped and prevent excessive heat. Replacing worn or bent push rods and eliminating settled or solidified material in the pump can help. Also, prevent hydraulic hammer and correctly install the vanes.
  • E
    Edward DownsAug 30, 2025
    How to prevent broken shaft in BLACKMER Power Pump?
    • D
      Danielle MurphyAug 30, 2025
      To prevent a broken shaft in your BLACKMER Power Pump, take these precautions: Prevent foreign objects from entering the pump. For high viscosity fluids, use an EC Rotor & Shaft. Ensure the relief valve opens correctly and prevent hydraulic hammer. Align the pump and driver correctly. Replace excessively worn vanes and eliminate settled or solidified material in the pump.
  • K
    kingmichaelSep 4, 2025
    What to do if BLACKMER Power Pump has mechanical seal leakage?
    • P
      Paul ThomasSep 4, 2025
      If your BLACKMER Power Pump is experiencing mechanical seal leakage, consider these solutions: Use compatible O-rings and replace any that are nicked, cut, or twisted. Repair or clean the shaft at the seal area. Avoid overgreasing the ball bearings. Reduce excessive cavitation. Replace any cracked, scratched, or dirty mechanical seal faces.
  • M
    Michael AguilarSep 10, 2025
    Why is my BLACKMER Power Pump so noisy?
    • K
      Kelly MitchellSep 12, 2025
      Excessive noise in your BLACKMER Power Pump can stem from various issues. Try reducing excessive vacuum on the pump and adjusting the pump speed according to the liquid viscosity. Positioning the pump closer to the fluid source might help. Ensure the pump is securely mounted and replace any worn or damaged bearings. Properly anchor the piping and correctly align the drive coupling. Replacing an excessively worn rotor or fixing malfunctioning valves can also reduce noise. Adjusting the relief valve setting, replacing damaged vanes, or correctly installing the vanes are additional steps to consider.

BLACKMER GNXH2A Specifications

General IconGeneral
ModelGNXH2A
CategoryPower Pump
Port Size2 in
Max. Working Pressure150 PSI
Outlet Size2 in
Motor Power5 HP
Voltage230/460 V
Frequency60 Hz
Materials of ConstructionCast Iron, Stainless Steel
Drive TypeElectric
Phase3

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