Common Steps For Removal of Body Center Section


Common Steps For Removal of Body Center Section

Prior to starting any removal it is recommended that the body center section be removed from the bottom side of the truck. This is so the discharge and intake piping can remain in place in the pump house. It is important to mark any wiring, drain lines/tubing and other components to ensure proper assembly. If the truck is equipped with a belly pan or heat shield, it will need to be removed first.

*Note: The replacement body center section is shipped with intake adapters on it. The intake adapters require removal prior to installation of the center section if installing from the bottom side of the truck. They are provided for shipping purposes and are not required for the center section replacement. The use of the existing intake adapters is acceptable.

Tools that are recommended for this repair are:

  • Transmission jack: for removal of the pump transmission and to support the body center section if removed from the bottom side.
  • Come-a-long / Chain Hoist: to assist in supporting plumbing, manifolds and if needed to stabilize the pump body center section when removing from the bottom side.

Necessary Steps:

  • Open all discharge valves and drain the pump, also drain the water tank for removal of the tank to pump valve from the pump.
  • Remove the drive shafts from the pump transmission and the truck transmission and rear end. Remove them from beneath the truck.
  • Pump Transmission removal

Shift Unit: Disconnect manual shift linkage (if equipped) and the electrical connector(s) at the pump shift switch. If equipped with a pneumatic shift unit, bleed down the truck air system and disconnect the air lines from the shift unit.

Priming Pump: Disconnect the wires from the pump primer at the motor. From the toPSIde of the pump, disconnect the supply line from the priming valve (approximately 1″ hose that is attached to the priming pump).

Disconnect the primer lubrication supply line at the primer and the tank on the VPE priming systems, and remove the line from the pump compartment.

Support and unbolt the priming pump assembly from the pump transmission. Exercise caution when removing the priming pump assembly, carefully feeding the supply hose through the center section passage. Remove the assembly from the truck.

Drain Valve: Tag or mark the drain lines and remove them from either the pump and the drain valve, disconnect the cable and unbolt the drain valve and bracket from the pump transmission. Remove the assembly from the truck.

Assure there is sufficient room on the rear side of the pump transmission in the area of the oil circulation pump and water tank/truck body). Approximately 3 to 4 inches are adequate and the oil pump can remain on the pump transmission. If there is less than 3 inches the pump transmission should be drained of its contents and the oil pump and hoses removed.

Remove oil circulation pump if needed. It is recommended that the separable impeller shaft spline connection be lubricated with to assist with disassembly.

Loosen the four mounting bolts (3/4″ wrench) from the pump transmission to the fire pump. Once loose, position the transmission jack beneath the pump transmission and secure it to the jack. (The pump transmission will be somewhat unstable so take the time needed to support it the entire time when backing it off the impeller shaft splined connection).

Remove the four bolts and proceed by sliding the pump transmission back off the splined connection until it is free of the impeller shaft. If you are unable to slide the pump transmission, there are jacking screw holes provided on the face of the pump body mounting flange to assist with the removal. Now the pump transmission can be slowly lowered down to the floor. This is where it may be necessary to raise the truck so adequate clearance can be achieved for removal of the transmission from beneath the truck

Removal of the Body Center Section

Transfer valve actuator: This pump is equipped with a top mounted manual transfer valve actuator. Remove the manual shift rod from the actuator arm and position the arm inward to allow clearance between the actuator arm and the intake adapter.

Relief Valve: Mark the lines for the relief valve and remove them. They may require removal at both ends, setting them aside. Remove the two bolts from the connecting pipe of the relief valve. Support the relief valve and remove the four mounting bolts. Set the relief valve and connecting pipe aside.

Tank to Pump Valve: Remove the linkage for the tank to pump valve. Then unbolt and remove the tank to pump valve.

Discharge Piping: Loosen the bolts from the discharge flange at the pump body. Support and adjust until the bolts can be removed with no resistance. If possible gain .75 to 1 inch clearance between the pump body and the discharge flange.

Bottom Side Inspection: Assure there are no lines, hoses, piping or any obstructions remaining from the bottom side of the pump. If there are obstructions remove or adjust for clearance. Position the transmission jack under the center section and secure the center section to the jack.

Priming valve: Mark the wires and remove the wiring from the priming valve, along with the manual actuator linkage (if equipped). Remove the priming valve from the pump and set it aside.

Top Side Inspection: Assure there are no valves, lines, hoses, piping or any other obstructions remaining on the body center section. If there are, remove and secure them for removal of the body center section.

Intake Adapters: With the transmission jack in place and secured, loosen the mounting bolts on the intake adapters at both the body center section and the mounting plates. The mounting bolts at the mounting plates should be loosened as much as possible to allow separation from the intake flanges and the body center section. Secure the intake adapters and slowly begin removal of the bolts from the intake adapters at the body center section. Prior to removing all of the bolts, assure the jack is capable of raising the body center section and adjust so there is minimal resistance on the remaining bolts.

Lowering of Body Center Section: Exercise caution when lowering the body center section and assure there is someone watching from the top and both sides to assure there are no interference problems. In addition assure everyone is at safe distance in the event the jack should fail or the body center section should slide or tip from the jack.

With the body center section removed it is important to clean and prep all gasket surfaces prior to re-assembly. At this time inspect and clean out all lines, fasteners, and lubricate threads to assist in reassembly. To install the new body center section reverse these steps.

When the pump transmission is being slid onto the impeller shaft, a small amount of never-seize or related lube may be added to the splines of the impeller shaft. The amount should only be enough to give the first .5 inch of the splines a wet appearance. It is important to assure the pump transmission is square with the pump body while mating the splines together.

CAUTION: Do not apply lubricant to the splines of the Driven Shaft (female end) of the transmission. Lubricant shall only be applied on the splines (male end) of the impeller shaft to create a wiping effect when the splines are mated.

Excessive lubricant may prevent the splined connection to engage completely, resulting in an air lock or shock absorber effect.

If you have any questions regarding this information or need any assistance, please contact us at: 
Telephone: 651-450-5200
Fax: 800-488-1228