Waterous CR Overhaul Instructions
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Waterous CR Overhaul Instructions

Fire pump
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CR Pump
CRU-1 Pump
F-1031-4214 (Revised: 5/8/20)
Waterous Company, 125 Hardman Avenue South, South St. Paul, Minnesota 55075 USA (651)
Model CR, CRU-1 and CRU-2 Fire Pump

Table of Contents

General Overhaul Information....................................................
Remove Intake End of Pump........................................ 3
or Transmission......................................................... 4
Inspection and Repair...................................................
Install Mechanical Seal................................................7, 8
Install Impeller and Intake Adapter.................................... 9
Lubrication..................................................................... 10
Testing.......................................................................... 10
CRU-2 Pump
450-5000 www.waterousco.com
Overhaul Instructions
2
5, 6

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  • Page 1: Table Of Contents

    5, 6 Reassembly: Install Mechanical Seal…………………………………...……7, 8 Install Impeller and Intake Adapter……………………………... 9 Lubrication…………………………………………………………… 10 Testing……………………………………………………………….. 10 CR Pump CRU-1 Pump CRU-2 Pump F-1031-4214 (Revised: 5/8/20) Waterous Company, 125 Hardman Avenue South, South St. Paul, Minnesota 55075 USA (651) 450-5000 www.waterousco.com...

  • Page 2: General Overhaul Information

    Installing Ball Bearings Cleaning Most Waterous pumps are designed so that ball bearings fit tightly on their shafts and have relatively loose fits in the bearing housings. When The continued satisfactory operation of a pump depends to a great extent mounting these bearings on shafts, always apply force to the inner races.

  • Page 3: Disassembly: Remove Intake End Of Pump

    Disassembly - Remove Intake End of Pump Intake Adapter, Impeller & Mechanical Seal Removal NOTE: The wear ring in the intake adapter cannot be removed without being destroyed. Inspect the wear rings and impeller per instructions on Page 5 to determine if replacement is required.

  • Page 4: Remove Pump From Bearing Housing Or Transmission

    Disassembly - Remove Pump from Transmission or Bearing Housing Removal of End Yoke Removal of Oil Seal, Throttle Bushing, Mechanical Seal Stationary Ring Stand the pump in a vertical position with the intake adapter flange of the pump Remove the oil seal from the bore in the volute body. body volute facing down.

  • Page 5: Inspection And Repair

    Inspection and Repair Impeller and Wear Rings Check wear rings and impeller hubs for deep grooves or scratches. Spirol on the impeller hub on which it was used. Hold the wear ring firmly against grooves or grooves parallel to the impeller shaft increase leakage. Inspect one side of the hub and measure total clearance on the opposite side, for excessive wear ring clearance.
  • Page 6 Inspection and Repair (Cont’d) Impeller Shaft Examine shaft for signs of severe scratches, grooves or corrosion, espe- Scratches in the area of the bellows of the mechanical seal can possibly cially under the oil seal or mechanical seals. If scratches are not severe, be removed by spinning the shaft in a lathe and polishing with a fine and are not under seals, they can be ignored.

  • Page 7: Reassembly

    Identify the lapped surface of the seal stationary ring. The un- lapped face of the stationary ring has a mark. The lapped Note: If Waterous Mechanical Seal Lubricant part no. 52608 is not available, surface has no mark, P80 rubber lubricant, straight dish soap or glycerin may be substituted.
  • Page 8 Install Mechanical Seal (Continued) Install the seal bellows: Install the seal spring over the seal bellows. a). Apply a piece of tape over the shaft keyway which will protect the seal Install the seal spring retainer on the back side of the impeller. bellows during installation.

  • Page 9: Install Impeller And Intake Adapter

    Install Impeller and Intake Adapter Install the impeller key and impeller on the shaft. Install the impeller Install the sixteen (16) screws and lockwashers. Tighten the screws until washer and nut. Note that the raised rib on the washer must face the the flange of the intake adapter contacts the volute body.

  • Page 10: Lubrication

    Lubrication Testing Fill pump bearing housing or transmission with lubricant specified on Before the pump is returned to service, it is advisable to give it vacuum, hydrostatic and operational tests to check it for leaks and to make sure the pump or transmission Operation and Maintenance instructions.

This manual is also suitable for:

Cru-1Cru-2

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