Specifications Information and Repair Parts Manual
BRP500TP2, BRP520TP3, BRP650HP2
800-350-8739
3
MBRP500TP2 Rev A | 3/2020
Storing Pump
1. When pump is out of service for an extended period of time, completely
drain liquid from casing, store pump in a dry, protected, well-ventilated
area.
2. Add fuel stabilizer to engine fuel tank or drain fuel from tank. Turn fuel tank
valve to off position.
COMPLETE PUMP ASSEMBLY PROCEDURE
Reference Repair/Replacement Part Exploded View and Lists
NOTE:
Do not use petroleum based lubricants with EPDM rubber seal parts
and O-rings. Petroleum based products will damage EPDM components.
NOTE:
Apply a small amount of anti-seize lubricant to bore, threaded or keyed,
in impeller. If petroleum based anti-seize lubricant is used do not allow it to
contact EPDM components.
Install Seal Stationary Half
1.
Lay bracket (Ref. No. 2) on a solid surface, engine mount down. Apply
silicone sealant (Loctite® RTV or similar) to outside metal case of shaft
seal stationary half (Ref. No. 8). Position in cast bore of the bracket with
polished seal ring up. Install by pressing on metal housing of the seal with
a piece of plastic pipe or similar stock until metal case lip seats against
bracket. Do not press on lapped seal surface to install.
Install Shaft Collar - 5/8-18 threaded “P” & “S” pumps and kits:
1.
Install shaft collar (Ref. No. 10) on PTO shaft. Orient large inside diameter
chamfer towards PTO shaft shoulder. Slide collar down shaft until it
contacts PTO shaft shoulder.
Install Bracket
1.
Lay engine (Ref. No. 1) down on recoil starter with PTO shaft up vertical.
Clean PTO shaft and mounting surface.
2.
Install adapter gasket (Ref. No. 37) onto the PTO shaft.
3. Position bracket on engine. Fit locating diameter on back of bracket into
PTO bearing bore in engine crankcase cover. Make sure all four bolt
bosses on bracket sit flat on engine crankcase cover. Rotate until bracket
feet align with engine block mounting base.
4.
Install four O-rings (Ref. No. 7) on four screws (Ref. No. 6). Install screws
through bracket into engine crankcase cover making sure O-rings seat in
cast counter bore of bolt hole. Torque screws to 140 in-lb.
Install Closed Impeller -3/4” keyed “P” pump kits
1.
Temporarily install impeller (Ref. No. 11) on PTO shaft. If impeller hits
inside of bracket before bottoming against PTO shaft end insert shims
(Ref. No. 12) between end of PTO shaft and impeller until 0.60” clearance
is achieved. Remove impeller from PTO shaft.
NOTE:
The .060 clearance is critical tp prevent intyerference of the impeller
hitting the bracket potentially caising the pump to seize.
2.
Insert key (Ref. No. 14) into impeller keyway.
3.
Install shaft seal rotating half (Ref. No. 8) into bore in impeller hub.
Lubricate rubber cup of the seal with soapy water. Position in impeller hub
bore with polished face out. Protect polished face of the seal from damage
with a piece of cardboard or cloth. Press seal into bore until it bottoms.
4.
Install O-ring (Ref. No. 16) into bore in front of impeller nose. Slide
impeller screw (Ref. No. 15) into through hole. If required install shims
inside impeller bore, position on exposed screw end.
5. Align key with PTO shaft keyway. Slide impeller onto PTO shaft. Fix on
shaft with screw. Torque screw to 140 in-lb.
Install Semi-Open Impeller -3/4” keyed “S” pump kits
1.
Temporarily install impeller (Ref. No. 11) on PTO shaft. End of PTO shaft
must contact bottom of shaft bore in impeller hub. If impeller rear shroud
contacts bracket before end of PTO shaft contacts bottom of shaft bore in
impeller, install shims (Ref. No. 12) in bore until impeller clears bracket.
2. Measure normal distance from impeller vane front face to bracket inside
face with a micrometer or similar accurate measuring instrument.
3.
Lay volute (Ref. No. 18) on its nose exposing bracket mounting surface.
Measure normal distance from volute mounting surface to impeller wear
face.
4. Adjust amount of impeller shims until assembled clearance between
impeller face and volute face is 0.01” to 0.03”. Remove impeller from
shaft.
5.
Insert key (Ref. No. 14) into impeller keyway.
6. Install shaft seal rotating half (Ref. No. 8) into bore in impeller hub.
Lubricate rubber cup of the seal with soapy water. Position in impeller hub
bore with polished face out. Protect polished face of the seal from damage
with a piece of cardboard or cloth. Press seal into bore until it bottoms.
7.
Install O-ring (Ref. No. 16) into bore in front of impeller nose. Slide
impeller screw (Ref. No. 15) into center hole through impeller. If required
install shims used to set impeller clearance inside impeller bore, position
on exposed screw end.
8. Align key with PTO shaft keyway Slide impeller onto PTO shaft. Fix on
shaft with screw. Torque screw to 140 in-lb.
Install Volute
1.
Lay volute (Ref. No. 18) on its nose exposing bracket mounting surface.
Install O-ring (Ref. No. 17) into groove.
2.
Position volute on pins (Ref. No. 5) installed in bracket. Volute will go on
only one way, with discharge opening to the top. Slide volute on pins until
it seats against bracket.
3.
Secure volute to bracket with screws (Ref. No.19). Torque screws to 50
in-lb.
Install Casing
1.
Install check valve (Ref. No. 21) on volute nose. Make certain valve is
oriented correctly with flapper hinge at the top. Align notch in mounting
ring with rib cast into top of volute nose.
2.
Install casing O-ring (Ref. No. 20) onto casing (Ref. No. 22). Lubricate
with soapy water.
3.
Install casing onto bracket. Screws (Ref. No. 27) are held into casing
body with O-rings (Ref. No. 28) and square nuts (Ref. No. 4) are held
into bracket ears with clips (Ref. No. 3) to make installation easier. Align
casing to bracket and install six screws. Torque screws to 100 in-lb.
