Waterous CRQB Series User manual

Read through the safety information
and overhaul instructions carefully
before repairing your Waterous
CRQB Series Fire Pump.
Table of Contents
Introduction 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Repair Parts 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cross-Section View of CRQB 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Overhaul Information 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembly Index 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reassembly Index 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE: Instructions subject to change without notice
Waterous Company, 125 Hardman Avenue South, South St. Paul, Minnesota 55075 USA [phone]
www.waterousco.com
F-1031, Section 4319 (Revised: 1/19/18)
CRQB Series Fire Pump
Overhaul Instructions

F-1031, Section 4319 Page 2 of 32
Introduction
This instruction provides the necessary steps to overhaul CRQB fire pumps. Note that the instructions are divided into Disassembly and Reassembly sections.
Ordering Repair Parts
When ordering repair parts, furnish the reference number of the component (from Service Parts List) along with the Pump Model (CRQB) and serial number.
Refer to the Service Parts Lists furnished with your pump for identification of individual components.
The following repair kits are available for servicing the components identified:
Component Repair Kit Includes
Mechanical Seal K 716 One Mechanical Seal
Transmission Gaskets K 1158 All O-rings used on one Transmission
Cross-Section View of Model CRQB Fire Pump

F-1031, Section 4319 Page 3 of 32
General Overhaul Information
Tools and Equipment
The following tools and equipment are needed to overhaul a pump:
1. Usual automotive mechanic's hand tools.
2. An arbor press for assembling or disassembling components.
3. An engine lathe for turning impeller hubs.
4. A suitable hoist and slings.
5. Torque capability up to 300 lb-ft.
While no special tools and equipment are required, a few special items are
illustrated or described so the mechanic can make them. They are also avail
able from the apparatus manufacturer or the Waterous Company. These
special items are not absolutely necessary, but they will make the mechanic's
work much easier.
Preliminary Testing
Before disassembling a pump, test it thoroughly, if possible, and record the
results. A comparison of this test with the periodic tests recommended in form
F-1031, Section 1000 can often reveal specific pump troubles. Excessive
speed, for instance, indicates that impellers and/or wear rings are probably
worn.
Cleaning
The continued satisfactory operation of a pump depends to a great extent
upon the cleanliness of its internal parts. Sand, dirt or other abrasive material
will wear bearings, gears and related parts. Before disassembling a pump for
repairs, be sure to clean its exterior. Make sure the working space, benches
and tools are clean. Use only clean, lint-free cloths to wipe off components.
Before reassembling a pump or its components, be sure to clean them thor
oughly.
Pump Bodies and Impellers
Flush out these components and related parts with clean water. Use a stiff
brush to remove loose scale, caked sediment, etc. Be sure to remove all
traces of old gaskets. Examine pump bodies, covers, adapters and fittings for
cracks, severe corrosion or other damage. Almost all damage to these parts
results from improper use or maintenance, or from freezing. Replace defective
parts.
Bearings, Gaskets, Seals and O-rings
Parts of this nature are frequently damaged during removal or disassembly. In
addition, they sometimes deteriorate or lose their effectiveness because of
age or misuse. Replacing these parts whenever overhauling a pump is a good
policy.
Impeller Shafts
Examine shaft for severe scratches, grooves or corrosion - especially under
seals. If scratches are not severe, and are not under packing and seals, clean
them with a fine-cut file. Grooves are usually permissible if they are not sharp
or too deep. Slight longitudinal scratches will cause leaks and should be
removed.
Installing Ball Bearings
Most Waterous pumps are designed so that ball bearings fit tightly on their
shafts and have relatively loose fits in the bearing housings. When mounting
these bearings on shafts, always apply force to the inner races. When bear
ings have a tight fit in the housings, and a heavy force is necessary to install
them, be sure to apply force only to the outer bearing races. For either type of
fit, applying force to the wrong bearing race may damage the balls and race.
Installing Oil Seals
Before installing an oil seal in a housing, be sure that the seal, shaft and
housing are clean.
Apply force to the outer edge of the seal and press in evenly.

Disassembly Index: Reassembly Index:
Remove Pump from Vehicle:
Drain Fluid from Transmission 5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove Pump from Vehicle 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove Intake End of Pump 6. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remove Pump from Transmission 7. . . . . . . . . . . . . . . . . . . . . . .
Remove Chain:
Remove Case Covers 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnect and Remove Chain 9. . . . . . . . . . . . . . . . . . . . . . . . . .
Remove Impeller Shaft:
Remove Impeller Shaft from Case 10. . . . . . . . . . . . . . . . . . . . . .
Remove Drive Shaft:
Remove End Yoke and Hydraulic Adapter 11. . . . . . . . . . . . . . .
Remove Drive Shaft from Case 12. . . . . . . . . . . . . . . . . . . . . . . .
Disassemble Shaft:
Impeller Shaft 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive Shaft 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assemble Shafts:
Assemble Drive Shaft 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assemble Impeller Shaft 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Drive Shaft:
Install Bearing in Case 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Drive Shaft in Case 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjust Position of Shaft 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Oil Seal Housing and End Yoke 21. . . . . . . . . . . . . . . . . .
Install Hydraulic Adapter 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Impeller Shaft:
Install Impeller Shaft in Case 22. . . . . . . . . . . . . . . . . . . . . . . . . .
Install Bearing Cover 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Chain:
Install Chain in Case 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect Chain 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Case Covers 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Pump on Transmission:
Install Oil Seal in Pump Body 27. . . . . . . . . . . . . . . . . . . . . . . . . .
Install Pump Body on Transmission 27. . . . . . . . . . . . . . . . . . . .
Assemble Pump:
Install Mechanical Seal 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Impeller and Intake Adapter 30. . . . . . . . . . . . . . . . . . . . .
Final Assembly Steps 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing:
Hydrostatic 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operational 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F-1031, Section 4319 Page 4 of 32

F-1031, Section 4319 Page 5 of 32
Disassembly - Remove Pump from Vehicle
Drain Fluid from Transmission
1. Remove drain plug from transmission pan. Transmission holds approximately 4.5 quarts (4.25 liters) of lubricant.
Remove Pump
1. Disconnect driveline, intake piping, discharge pip
ing, drain lines and any accessory equipment con
nections.
2. Remove the fasteners attaching pump to the
vehicle frame.
3. Lift the pump out of the vehicle.
Oil Fill
and
Level
Oil Drain
(Magnetic)
Oil Level
Sight Plug

F-1031, Section 4319 Page 6 of 32
Disassembly - Remove Intake End of Pump
Intake Adapter, Impeller & Mechanical Seal Removal
5. Remove the impeller. Tapping the impeller lightly with a soft hammer will help to
break it loose from the shaft. If necessary, the seven (7) 3/8-16 UNC tapped holes
through the impeller vanes may be used to attach a puller. If the seal spring retainer
remains attached to the back of the impeller, remove and discard.
6. Remove the impeller key from the shaft.
7. Remove the mechanical seal spring.
8. Remove the mechanical seal bellows. First apply a light coating of oil to the mechanical
seal journal then grasp the seal bellows by hand and and try to remove with a combined
pulling and twisting motion. If this method fails, proceed with the steps on the next page
to remove the pump from the transmission. The seal bellows will be forced off the shaft
during this step.
NOTE: The wear rings in the volute body and intake adapters cannot be removed without being destroyed. Inspect the wear rings and impeller per instructions on
Page 15 to determine if replacement is required.
1. Make a witness mark on the intake adapter and volute body to indicate their
relationship to each other which will be referenced during reassembly.
2. Remove the sixteen (16) hex head screws attaching the intake adapter to the
volute body. The screws may be threaded into the four (4) jacking screw
holes in the adapter flange and tightened in a circular sequence to separate
the intake adapter from the pump volute body.
3. Pull the intake adapter off of the pump body volute. Remove and discard the
O-ring.
4. Remove the cotter pin, impeller locknut and washer from the end of the im
peller shaft.
Key
Mechanical Seal Bellows
Mechanical Seal Spring
Mechanical Seal Spring Holder
Impeller
O-ring
Intake Adapter
(16) Hex Head Screws
Impeller Locknut
Tapped Jacking Screw Hole
(4) Located in Intake Adapter Flange

F-1031, Section 4319 Page 7 of 32
Disassembly - Remove Pump from Transmissions
Removal of End Yoke
1. Stand the pump in a vertical position with the intake adapter flange of the pump
body volute facing down.
2. Note the orientation of the pump discharge flange relative to the transmission as
the pump must be reassembled with the same relation.
3. Remove the eight (8) hex nuts and lock washers attaching the pump volute to the
transmission.
4. With a hoist, lift the pump volute body off of the transmission. If the body does not
break free, tap the body with a soft hammer while lifting until separation is achieved.
5. Once the pump volute body is free of the transmission, remove the O-ring from the
groove in the transmission pump mounting flange.
Mechanical Seal
Stationary Ring
Removal of Oil Seal, Throttle Bushing, Mechanical Seal Stationary Ring
1. Remove the oil seal from the bore in the volute body.
2. From the transmission side of the body, drive the throttle bushing out of the body
bore. This will also remove the mechanical seal stationary ring.
3. Inspect the throttle bushing per instructions on Page 16 to determine if replace
ment is required.
O-ring
Hex Nuts and
Lockwashers
Pump Body
and Volute
Throttle Bushing
Oil Seal

F-1031, Section 4319 Page 8 of 32
Disassembly - Remove Chain
Remove Case Covers
1. Remove the transmission case covers as shown to access the chain.
Pan
O-ring
O-ring
Top Cover
Wave Spring
O-ring
Bearing Cover
Hex Head Screw
3/8-16 x 1 in.
Hex Head Screw
3/8-16 x 1 in.
Hex Head Screw
3/8-16 x 1 in.
O-ring

Disconnect and Remove Chain
2. As viewed from the oil pan end of the transmission, rotate the shaft until the
chain connecting pin is located (chain link with spirol pins on each side of the
chain).
3. Align the connecting pin with the access hole in the side of the case.
4. Remove one spirol pin from the connecting pin. Note that the spirol pin indicated
must be removed as the pin must be extracted through the access hole in the
case.
5. Push the connecting pin into the chain towards the access hole as indicated.
6. With a needle nose pliers, reach into the access hole, grasp the pin and remove.
Note that the connecting pin consists of two pieces.
7. Separate the ends of the chain and remove from the transmission.
Step 2
Connecting Pin
Step 3
Access Hole
Step 4
Step 5 Step 6
Remove Spirol Pin
F-1031, Section 4319 Page 9 of 32

F-1031, Section 4319 Page 10 of 32
Disassembly - Remove Impeller Shaft
Remove Impeller Shaft from Case
1. With the transmission resting on the pump mounting flange, press the impeller shaft down and out of the case.

F-1031, Section 4319 Page 11 of 32
Disassembly - Remove Drive Shaft
Remove End Yoke and Hydraulic Adapter
1. Remove the hydraulic pump, hydraulic adapter and end yoke from the drive shaft.
2. Remove and discard oil seals and O-rings.
Hydraulic Pump
(Not supplied by Waterous)
Oil Seal
Hydraulic Pump Adapter
O-ring
Wave Spring
O-ring
Oil Seal
End Yoke
Oil Seal Housing
Hex Head Screw
3/8-16 x 1 in.
Hex Head Screw
3/8-16 x 1 in.
Hex Head Screw
3/8-16 x 1 in.
Locknut and Washer

Remove Drive Shaft from Case
1. With the transmission case resting on the pump mounting flange side, press the drive shaft down until the drive sprocket contacts the inside wall of the case.
2. Continue to press the shaft down and out of the case. Note that the drive sprocket, spacer, bearing and oil seal sleeve will remain in the case.
3. Remove the drive sprocket, spacer, bearing and oil seal sleeve from the case.
Drive Sprocket
Pump Mounting Flange
Drive Shaft
Oil Seal
Sleeve,
Bearing,
Spacer and
Sprocket.
Remove from
case once
shaft is out
of case.
F-1031, Section 4319 Page 12 of 32

F-1031, Section 4319 Page 13 of 32
Disassembly - Disassemble Shafts
Disassemble Impeller Shaft
1. Remove the bearing locknut and washer.
2. Press the shaft out of the outbaord bearing, spacer & sprocket while supporting the sprocket.
3. Remove the key.
4. Remove the spacers.
5. Press the shaft out of the inboard bearing.
6. The oil seal sleeve used prior to January 15, 2018 may be left on the shaft if undamaged. If damaged or upgrading to the latest shaft and oil seal design, remove.

Disassemble Drive Shaft
1. Remove the sprocket key.
2. Remove the spacer.
3. Remove the outboard bearing.
Spacer
Sprocket Key
Drive Shaft
Outboard
Bearing
F-1031, Section 4319 Page 14 of 32

F-1031, Section 4319 Page 15 of 32
Reassembly
Inspection and Repair
Impeller and Wear Rings
Check wear rings and impeller hubs for deep grooves or scratches. Spirol
grooves or grooves parallel to the impeller shaft increase leakage. Inspect
for excessive wear ring clearance. Diametric clearances in excess of .027
inches may warrant wear ring replacement. Original factory clearance is .019
to .023 diametrically. The diametric clearance should be determined by
averaging the results of four measurements taken at 90 degree increments
as follows:
Clean and remove small burrs or other protrusions from the wear ring inner
diameters and the impeller hub O.D. and I.D. Position each wear ring on the
impeller hub on which it was used. Hold the wear ring firmly against one side
of the hub and measure total clearance on the opposite side, using a feeler
gauge. Do not bottom the wear ring against the bottom of the groove in the
impeller.
Impeller hub to wear ring clearance is restored by turning impeller hubs to
sizes noted in table and by installing matching undersize wear rings. See
table.
Ball Bearings
When cleaning bearings, bearing manufacturers recommend placing them in
a basket and suspending the basket in a container of solvent, preferably
overnight. Avoid rotating the bearings before solid particles are removed, to
prevent damaging races and balls.
After cleaning, spin them immediately in light oil and check each one
as described below:
1. Examine bearing for rusted or pitted balls, races or cages.
2. Check cage and races for cracks or other damage. Examine balls
and races for brinelling, abrasion and serious discoloration. If in
doubt about condition of bearing, replace it.
3. Rotate bearing slowly, and check for roughness or excessive inter
nal looseness. If a rough spot is found, it may be dirt caked on a race.
Try cleaning it again. If endplay is doubtful, compare it with a new
bearing. If the bearings are not to be installed right away, wrap them
in clean, oil proof paper.
Impeller and Wear Ring Repair Dimensions
Original Impeller Hub Dia. Original Wear Ring No. Reworked Impeller Hub Dia. New Wear Ring No.
7.501/7.499 72346 7.476/7.474
7.451/7.449
72346-25
72346-50

F-1031, Section 4319 Page 16 of 32
Inspection and Repair (Continued)
Impeller Shaft
Examine shaft for signs of severe scratches, grooves or corrosion, especially
under the oil seal or mechanical seals. If scratches are not severe, and are
not under seals, they can be ignored. Check for cracks, pitting or damaged
keyway.
Scratches in the area of the bellows of the mechanical seal can possibly be
removed by spinning the shaft in a lathe and polishing with a fine emery
cloth. The journal for the oil seal may be similarly cleaned, however, spiral
type polishing may lead to oil leaks.
Oil Seal Sleeve
Check for wear and scratches where the seal contacts the sleeve. The
journal may be polished with a fine emery cloth, however; any polishing that
leaves a spiral pattern may lead to an oil leak. If a groove has been worn in
the sleeve, it can be reused by turning it end for end.
If questionable, replace the sleeve or fit with a thin replacement sleeve. This
replacement sleeve allows use of the same size oil seal. This type of repair
sleeve is available through most sources of oil seals.
Volute Body and Intake Adapter
Examine for cracks, severe corrosion or other damage. Almost all damage to
these parts results from improper use or maintenance, or from freezing.
Replace defective parts.
Clean out drainage holes in volute body located between the seat for the
throttle bushing and oil seal.
Throttle Bushing
Note: The bushing serves as a restriction to fluid leakage if the mechanical
seal fails.
Examine the bore in the bushing for wear due to contact with the shaft. The
original size of the bore is 2.760/2.762 in. (70.10 / 70.15mm).
If bore is larger than original dimension, replace.

F-1031, Section 4319 Page 17 of 32
Reassembly - Assemble Shafts
Assemble Drive Shaft
1. Press the single row outboard bearing on the shaft.
2. Slide the spacer on the shaft.
Spacer
Drive Shaft
Outboard
Bearing

Assemble Impeller Shaft
1. Install the oil sleeve used on assemblies made prior to January 15, 2018
on shaft, if it was removed.
2. Press the double row bearing on shaft.
3. Install two spacers, key, driven sprocket and single spacer on shaft. Note
that single spacer chamfer must face away from the drive sprocket.
4. Press the single row bearing on shaft.
5. Install the bearing washer and bearing locknut on the shaft. When retaining
the shaft during locknut assembly, take care not to damage the mechanical
seal journal on the shaft.
6. Tighten nut 1/4 turn from finger tight and engage a tab of bearing washer
with slot of locknut.
F-1031, Section 4319 Page 18 of 32

F-1031, Section 4319 Page 19 of 32
Reassembly - Install Drive Shaft
Installing Bearing in Case
1. Install bearing in case bore. Bearing is to be flush with face of case flange.
2. Lay the transmission case on its side with the pump flange facing up.
3. Reaching through the opening in the case, set the spacer and then the driven sprocket on the bearing installed in step one. Note that the chamfer on the spacer must face towards
the bearing.
Driven Sprocket
Spacer,
.826 in. (20.98 mm) Wide
Bearing
Pump Mounting Flange

Install Drive Shaft in Case
4. Install the sprocket key in the drive shaft assembly.
5. Guide the drive shaft assembly into the sprocket bore.
6. Press the shaft assembly into the bore of the bearing previously installed in the
case while guiding the bearing on the shaft assembly into the case bore.
7. Tap the outer race of the bearing on the splined end of the shaft back until it is located
.500 in. (12.70 mm) below the face of the case flange.
Adjust Position of Shaft
Shaft Bearing
Sprocket Key, 1/2 in. x 2-1/2 in.
NOTE: Apply force to outer race of bearing.
F-1031, Section 4319 Page 20 of 32