Specifications
25FP-250-00
4
07/2012
Specifications Information and Repair Parts Manual 25FP Series
x
25FP Fire Pump Series
Discharge check valve/gasket (excessive wear)…SEMI-
ANNUALLY
Engine lubrication – See Engine manufacturer’s service
manual.
Inspect, clean, and replace components as needed.
PUMP & SEAL DISASSEMBLY & REASSEMBLY
Review all SAFETY information provided in this manual and pump
general safety manual.
Follow the instructions on all tags, labels, and decals attached to
the pump.
This pump requires little service. However, if it becomes necessary to
inspect or replace the wearing parts, follow these instructions which are
keyed to repair part lists and repair part explosions.
This manual will alert personnel to known procedures which require
special attention, to those which could damage equipment, and to
those which could be dangerous to personnel. However this manual
cannot possibly anticipate and provide detailed precautions for every
situation that might occur during maintenance of the unit. Therefore, it
is the responsibility of the owner/maintenance personnel to ensure that
only safe, established shop procedures are used, and that any
procedures not addressed in this manual are performed only after
establishing that neither personal safety nor pump integrity are
compromised by such practices.
Before attempting to service the pump, switch off the engine
ignition and remove the spark plug, or take other precautions to
ensure that it will remain inoperative. Close all valves in the
discharge lines.
Before attempting to service the pump:
Familiarize yourself with this manual.
Shut down the engine and remove the spark plug wires to
ensure that the pump will remain inoperative.
Allow the pump to completely cool if overheated.
Check the temperature before opening any covers, plates, or
plugs.
Close the discharge valve.
Vent the pump slowly and cautiously.
Drain the pump.
For engine disassembly and repair, consult the literature supplied with
the engine, or contact your local engine service representative.
PUMP DISASSEMBLY
First Step:
1. Disconnect the priming vacuum hose (C31) female SAE
fitting (C34) from the male SAE fitting (B33) installed in the
ball valve (B32).
2. Remove the casing drain plug (B9) and drain the pump
casing. Clean and reinstall the plug.
Remove Casing:
For access to the impeller (B15) and shaft seal assembly (B19 & B20),
1. Remove the nuts (B12) securing the pump casing (B8) to the
intermediate (B3).
2. Remove the casing from the intermediate.
3. Remove the casing o-ring (B21) and clean all mating
surfaces.
Inspect the casing wear ring/inlet (B13) for excessive wear or damage.
The wear ring is secured in the casing with a press fit. If replacement is
required remove existing worn ring and replace with a new
replacement ring. Be careful not to damage the casing ring bore when
removing existing ring.
Remove Discharge Check Valve Body:
1. Remove the nuts (B27) and separate the check valve body
(B24) from the pump casing.
2. Pull the flange gasket (B22) from the flange studs (B26), and
pull the check valve arm (B25) from the check valve body.
Clean the mating surfaces of both flanges and inspect all parts for wear
or damage.
Remove Impeller:
To remove the impeller (B15),
1. Insert a steel bar or drift pin between the vanes, and turn the
impeller in a counter-clockwise direction (when facing the
impeller) while holding the engine crankshaft stationary. Be
careful not to damage the impeller vanes.
Seal Removal and Disassembly:
1. Remove the impeller shims if so equipped, not all pumps will
require shims. Tie and tag the shims or measure and record
their thickness for ease of reassembly.
2. Remove the seal spring, and then slide the shaft sleeve
(B16) and rotating portion (B18) of the seal off the engine
shaft as a unit.
3. Slide the rotating portion of the seal off the sleeve.
4. Remove the stationary seal ring (B20) from the intermediate,
see following section.
Remove Intermediate:
1. Remove the nuts (B5) holding the intermediate (B3) to the
engine (B1). Remove the intermediate from the engine.
Inspect the balance ring (B6) if so equipped for excessive wear or
damage. The balance ring is secured in the intermediate by a press fit.
If replacement is required remove existing worn ring and replace by
pressing in a new ring. Use Loctite® or similar thread-locker in bore
before pressing in new ring. Be careful not to damage the intermediate
ring bore when removing existing ring.
Remove and Disassemble Exhaust Primer:
[25FP23AR & 25FP13AR]
1. Remove vacuum hose (C31) female SAE swivel fitting (C34)
from male SAE fitting (B33) installed in casing vacuum ball
valve (B32).
2. Remove the vacuum hose NPT fitting (C33) from the ejector
body (C5).
3. Remove the ejector jet (C7) from ejector body.
4. Remove the ejector body from the venturi (C6).
5. Remove the venturi from the valve body (C2).
All parts unthread counterclockwise. Clean any deposits or buildup on
the parts.
6. To remove the valve body unthread from muffler outlet
[25FP23] or loosen clamp (C11) [25FP13AR] and slide
connecting nipple (C10) off of muffler outlet.
Remove and Disassemble Hand Primer:
The hand primer (C12) [25FP13HR] is a complete unit that requires
little maintenance.
1. Remove vacuum hose (C31) female SAE swivel fitting (C34)
from male SAE fitting (B33) installed in casing vacuum ball
valve (B32).
2. To remove hand primer assembly from mounting bracket
(A37) remove mounting screws (A41). Separate hand primer
from mounting bracket.
3. Remove bolts (C21) and nuts (C22) holding pump body
together.
4. Separate lower half (C14) of pump body from upper half
(C13).
5. Remove diaphragm (C15) if needed by removing fastener
(C17) holding diaphragm to plunger rod (C23).
6. Remove street elbow (C29) reducing bushing (C28) and