Magnum MCP5538 Operating instructions

Operating and Maintenance Manual
3” Gas Engine Powered Diaphragm Pumps
Models MCP5538-6538
215 Power Dr
Operation Manual Contents
Keep this information guide or a copy of it with the pump.
Contact Magnum Products LLC for additional copies if this
manual should become lost. If you have any questions regarding
operating or servicing this p
Berlin, WI 54923
Fax [phone]
Tel [phone]
ump please contact Magnum
Products LLC at 1-800-926-9768.

5538(ce)-6538(ce) Gas
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peration Manual Contents:O
•Serial Number/Model Number Information Pg. 2
•Safety Information Pg. 3
•Service Safety Information Pg. 4
•Pump Specifications Pg. 5
•Sound Specifications Pg. 6
•Operating Instructions Pg. 6
•Pump Diagram Pg. 7
•Maintenance Requirements Pg. 8
•Changing a Diaphragm Pg. 8
•Changing a Flap Valves Pg. 8
•Troubleshooting Guide Pg. 9
•Exploded View Pg.10
•PartsList Pg.11
•Parts List Con’t Pg. 12
•Exploded View (Skid & Wheel Mounting) Pg. 13
•Parts List (Skid & Wheel Mounting) Pg. 14

Serial Number / Model Number:
A nameplate listing the Model Number and Serial Number is located on each
pump. The
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Serial Number Model Number
Model Number and Serial Number are necessary for ordering
arts or requesting service; it is important that you document these
umbers.
ecord Model Number and Serial Number Here:
p
n
R

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Safety Information:
Operator Safety: Internal Combustion Engines
DANGER! INDICATES AN IMMINENTLY HAZARDOUS SITUATION,FAILURE TO ABIDE BY
SAFETY PRECAUTIONS WILL RESULT IN DEATH OR SERIOUS INJURY.
DO NOT operate in an enclosed area, as
exhaust fumes are lethal.
DO NOT smoke while operating pump.
DO NOT smoke when refueling engine.
DO NOT refuel hot or running engine.
DO NOT spill fuel when refueling.
DO NOT refuel or operate near an open flame.
DO replace the fuel cap after refueling.
WARNING! INDICATES A POTENTIALLY HAZARDOUS SITUATION,FAILURE TO FOLLOW
INSTRUCTIONS MAY RESULT IN DEATH OR SERIOUS INJURY.
DO NOT operate this equipment without fully
understanding the operations procedures.
DO NOT touch hot surfaces, particularly the
muffler; doing so may cause serious burns.
DO NOT attempt to clear blockages or clean
the pump during operation. Rotating parts may
cause serious injury.
DO NOT pump flammable liquids.
DO NOT pump corrosive liquids. Contact local
authorities for assistance.
DO read, understand, and follow pump and
operation manual procedures.
DO be sure pump is on a firm, level surface and
will not tip, roll or fall while in operation.
DO operate pump only when guards are in
place.
DO store equipment properly when it is not in
use. Equipment should be stored in a clean,
safe location.
CAUTION! INDICATES A POTENTIALLY HAZARDOUS SITUATION,FAILURE TO FOLLOW
INSTRUCTIONS MAY RESULT IN A MINOR INJURY OR SEVERE DAMAGE TO THE PUMP.
DO NOT reduce the size of the discharge or try
to control capacity by throttling the discharge;
severe damage to the pump will result.
DO drain the pump in freezing weather by
tipping the unit towards the discharge.
DO flush the pump with clean water after
operation to remove any dirt and debris still in
the pump.

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Service Safety:
WARNING! POORLY MAINTAINED EQUIPMENT CAN BECOME A SAFETY HAZARD!IN ORDER
FOR THE PUMP TO OPERATE SAFELY AND PROPERLY,PERIODIC MAINTENANCE
AND OCCASIONAL REPAIRS ARE NECESSARY.
DO NOT attempt to clean or service the pump
while it is running. Rotating parts can cause
severe injury.
DO NOT crank a flooded engine with the spark
plug removed on gasoline-powered engines.
DO NOT test for spark on gasoline-powered
engines if engine is flooded or the smell of
gasoline is present.
DO NOT use gasoline or other types of fuels
or flammable solvents to clean parts. Fumes
from these fuels and solvents can accumulate
and cause an explosion.
DO operate the pump with all safety devices
and guards in place and in working order.
DO keep the area around the muffler free of
debris. A hot muffler may ignite the debris.
DO replace worn or damaged equipment with
parts recommended by Magnum Products LLC.
DO disconnect the spark plug on pumps with
gasoline-powered engines before servicing the
pump to avoid an accidental start.

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MAGNUM MODELS MCP5538 & 6538
3” DIAPHRAGM PUMP WITH HONDA GX160K1 GAS ENGINE
PUMP SPECIFICATIONS
POWER HONDA GX160K1 GAS ENGINE
4.1kw 5.5hp
ENGINE SPEED 2700 rpm
PUMP SPEED 63 strokes per minute
CAPACITY 333 l/m (88gpm)
SUCTION LIFT 7.5m (25ft)
DISCHARGE HEAD 7.5m (25ft)
SUCTION CONNECTION 75mm (3in)
DISCHARGE CONNECTION 75mm (3in)
SOLID HANDLING SIZE 43mm (1.7in)
WEIGHT (MODEL 5538) 63kg (138lb)
WEIGHT (MODEL 6538) 85kg (188lb)
SOUND PRESSURE LEVEL 83db(A); pump under load; engine speed
2800rpm; per EN ISO 3744:1995

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Sound Measurement Specifications:
The required sound specifications, per Appendix 1, Paragraph 1.7.4.f of the EC-
Machine Regulations, are:
•The sound pressure level at operator’s location (LpA) = 83 db (A)
•The sound power level (LWA) = 95 db (A)
These sound values were determined according to the ISO 3744 for the sound
power level (LWA) and ISO 6081 for the sound pressure level (LpA) at the operator’s
location.
The sound measurements were obtained with the unit operating on pavement at
nominal speed.
Operating Instructions:
1. Read the “Pump Safety” pamphlet in its entirety before operating the pump and observe safe
operating procedures at all times.
2. Read the engine operator manual in order to understand proper starting and stopping techniques.
Always start and stop the engine in accordance with the engine manufacturer’s
instructions.
3. Examine the pump carefully and read all instructions before beginning pump operation.
a. Notify the transportation company at once of any damage or loss that may have occurred
during transit.
4. When using a suction hose, make sure the gasket is in place and in good shape.
a. When using pipes, coat the threads with a sealing compound.
5. Make sure that the suction hose does not leak and that the lining is not loose or it will collapse
under suction pressure and block the hose.
a. To pump at maximum capacity, use a hose or pipe of the same size or larger than the
pump discharge.
6. Priming time depends on the height of the vertical suction lift, the length of hose between the
pump and the water level and the speed of the pump.
a. Maximum practical suction lift is approximately 25ft vertically from the surface of the water
to the pump suction.
b. Fastest priming and greatest capacity are achieved at low suction lifts.
c. For maximum performance, locate the pump close to water.
d. The pump will also prime faster at higher speeds.
7. On high suction lifts, or if the pump has been idle and the valves are dry, remove the cap on the
suction chamber and fill the pump with water.
a. This will help to seal the valves and speed up priming time.
8. Pump speed can be regulated with the engine throttle control.
a. Limit maximum speed to 65 strokes (diaphragm) per minute (2800 rpm engine speed)
b. Smoothest pump operation may be achieved by trying the pump at several speeds.

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Pump Diagram:

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Maintenance Requirements:
For engine maintenance, refer to the engine operation manual.
1. Change the transmission oil after the first 40 hours of operation.
a. Use SAE 80/90 EP gear oil.
b. Capacity is 20oz (550ml, 1 ¼ pints).
c. Fill with oil to the oil level plug located in the transmission cover.
d. Check the oil level daily before beginning operation.
2. Change the transmission oil every 400 hours of operation after the initial (40 hour) oil change.
3. Every 25 hours of operation, grease the pump connecting rod bearing by accessing it through the
connecting rod guard.
4. Keep the interior of the pump and the valves clean.
5. Flush out the pump with clean water after every operation.
6. Remove the pump connecting rod guard occasionally and clean the excess grease from the
pump connecting rod bearing.
Changing a Diaphragm:
1. Rotate the pump connecting rod to the down position by slowly pulling on the engine starter rope.
2. Remove the four bolts that clamp the diaphragm between the pump frame and the water box.
3. Remove the three nuts from the bolts that clamp the diaphragm between the connecting rod and
the diaphragm bottom plate.
4. Install the new diaphragm onto the bolts and diaphragm bottom plate.
5. Using a pipe spacer over the bolts, drive the diaphragm down into position on the diaphragm
bottom plate.
6. Install the diaphragm and diaphragm bottom plate assembly onto the connecting rod.
7. Tighten the three nuts and torque:
a. For 2” Pumps: 34-40N-m (25-30lb/ft)
b. For 3” Pumps: 45-54N-m (35-40lb/ft)
8. Center the diaphragm carefully over the water box and clamp with four bolts to the pump frame.
9. Tighten the bolts in a crossing pattern and torque:
a. For 2” Pumps: 34-40N-m (25-30lb/ft)
b. For 3” Pumps: 45-54N-m (35-40lb/ft)
Changing Flap Valves:
1. Remove the suction connection, discharge connection, and flap valves.
2. Install the weight and binder plates onto the new flap valve.
a. Use a thread-sealing compound on the screws.
b. Tighten the screws firmly but make sure that they do not distort the rubber, which would
cause poor seating.
3. Install the flap valves on the valve seats of the water box and suction connection with the binder
(the smaller plate) facing down into the hole.
4. Locate the flap valves on the spring pins in the suction connection and on the water box.
5. Reassemble the suction and discharge connections to the water box.
6. Tighten the bolts and torque:
a. For 2” Pumps: 20-34N-m (15-20lb/ft)
b. For 3” Pumps: 27-34N-m (20-25lb/ft)

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Troubleshooting Guide:
Problem Possible Reason
Pump does not prime AND/OR
Pump does not operate properly.
1. Pump may be too high above or too far away from the
water source.
2. There may be leaks in the suction hose or hose
connection.
3. Valves may not be sealing properly due to
accumulation of residue. Pour water into the suction
chamber to seal the valves.
4. Valves may not seal due to distortion. Adjust the
tightness of the suction and discharge connection
mounting bolts.
5. Check diaphragm for breaks and/or leaks.
6. Ensure that the end of the suction line is in position to
allow water to enter. The suction line may be buried
or blocked.
7. Do not allow any point of the suction hose to be
higher than the suction connection on the pump. A
trapped air pocket can form and prevent priming.
8. The pump will not operate properly under a positive
suction head condition.
Reduced Capacity. 1. The discharge line may be too small, too high or too
long causing:
a. Excessive bulging of diaphragm on the down
stroke.
b. Valves closing with a loud snap.
c. Overall rough operation.
d. Engine overloads and then slows down.
*Diaphragm pumps will handle fluids containing a
considerable amount of solids, however, if the mixture is too
heavy to be pumped, liquid must be added until the mixture
becomes sufficiently fluid for pumping.

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Models 5538-6538
3” Diaphragm Pumps, GAS Powered
Close Coupled
Ref.
No. 5538 Aluminum 6538 Cast Iron Qty. Description
1 P3309-A1 P3309-C2 1 3” Suction Connection
2 P3322-P3323 P3322-P3323 1 Plug with Gasket Assembly
4 P3041 P3041 2 3” Nipple
5 A010.050.0175 A010.050.0175 4 1/2"-13 x 1 3/4" Hex Screw & L.W.
6 18-051 18-051 2 1/8” x 3/8” Spring Pin
7 SA-10001N SA-10001N 2 3” Flap Valve Assembly
11 P3308P-A1 P3308-C2 1 Water Box
– Wheel Mtg. & Skid Mtg.
P3308AP-A1 P3308A-C2 Water Box – Cage Mtg.
12 P3310P-A1 P3310-C2 1 3” Discharge Connection
13 A020.050.0200ZC A020.050.0200ZC 3 1/2"-13 x 2” Carriage Bolt & H.N.
14 P3306-A1 P3306-C2 1 Diaphragm Bottom
15 P2726 P2726 1 #3E Diaphragm
16 A010.050.0225 A010.050.0225 4 1/2"-13 x 2 1/4" Hex Screw & H.N.
17 P4771P P4771P 1 Pump Frame
18 OEBX OEBX 1 3/4"-16UNF Jam Lock Nut
19 A010.050.0175 A010.050.0175 4
1/2"-13 x 1 3/4" Hex Screw & L.W. – Cage & Skid Mtg.
2 1/2"-13 x 1 3/4" Hex Screw & L.W. – Wheel Mtg.
19A A010.050.0250 A010.050.0250 2 1/2"-13 x 2 1/2" Hex Screw & L.W. – Wheel Mtg.
20
21
22 P3305A P3305A 1 Connecting Rod
22A W63-5008-175 W63-5008-175 1 Retaining Ring
24 P5581 P5581 1 Connecting Rod Bearing w/W33-3/16 Grease Fitting
25 W70-807 W70-807 2 Woodruff Key
26 P5583 P5583 1 Crank Arm
27 W35-C12329CRW1 W35-C12329CRW1 1 Lip Seal
28 A010.050.0150 A010.050.0150 1 1/2"-13 x 1 1/2" Hex Screw
29 BC090.C031.031 BC090.C031.031 1 5/16”-18 x 5/16” Socket Set Screw
30 R454A R454A 1 3/8” Vented Pipe Plug
31 P4850P P4850P 1 Case
32 P4858 P4858 1 Gasket
33 W16-6307 W16-6307 1 Ball Bearing
34 P4853 P4853 1 Gear Shaft
35 P5058 P5058 1 79 Tooth Gear
36 W16-6304 W16-6304 2 Ball Bearing
37 P4852 P4852 1 11 Tooth Pinion
38 P3417 P3417 1 85 Tooth Internal Gear
39 W16-6302 W16-6302 1 Ball Bearing
40 H705.025.0075 H705.025.0075 2 1/4" x 3/4" Dowel Pin
41 P4851P P4851P 1 Cover
42 P4945 P4945 1 Lifting Hook
43 A010.025.0125 A010.025.0125 2 1/4"-20 x 1 1/4" Hex Screw, L.W. & F.W.
44 W19-TB188 W19-TB188 1 Needle Bearing
45 P4854 P4854 1 14 Tooth Pinion (3/4” Bore)
46 W63-5100-118 W63-5100-118 1 Retaining Ring
47 W16-6006LLU W16-6006LLU 1 Ball Bearing
48 A010.025.0100 A010.025.0100 9 1/4"-20 x 1” Hex Screw & L.W.

5538(ce)-6538(ce) Gas
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Ref.
No. 5538 Aluminum 6538 Cast Iron Qty. Description
49 0002-1603 0002-1603 2 1/8” Square Head Pipe Plug
50 W35-T11141SM W35-T11141SM 1 Lip Seal
51 AF010.031.0100Z AF010.031.0100Z 4 5/16”-24 x 1” Hex Screw & L.W.
52 P4856 P4856 1 Engine Adapter
53 BC070.031.0100 BC070.031.0100 4 5/16”-18 x 1” Socket Screw & LKI.W.
54 P5601 P5601 1 3/16” Sq x 1” Key
58 P3365 P3365 1 3” NPT Strainer
63 P3691 P3691 1 Crank Arm Guard
64 DC290.X19.050FZ DC290.X19.050FZ 2 #10-24 x 1/2" Washer Head Self Tap Screw
Flap Valve Assemblies Available:
(Requires two per pump)
SA-10001B - Buna-N
SA-10001N - Neoprene
SA-10002N - Neoprene with Cloth Insert
Diaphragm Pump Rebuild Kits Available:
(Diaphragm and Flapper Assemblies including hardware)
W103-030.0T - TPE
W103-030.0R - Rubber
W103-030.0N - Neoprene
W103-030.0B - Buna-N

13 5538(ce)-6538(ce) Gas

5538(ce)-6538(ce) Gas
Models 5538-6538
Skid Mounting Close Coupled
Ref.
No. 5538
Aluminum 6538
Cast Iron Qty. Description
1 P3324L P3324L 1 Skid Frame Left
2 P3324R P3324R 1 Skid Frame Right
3 P3320A P3320A 2 Towing Pole
4 A010.037.0225 A010.037.0225 2 3/8”-16 x 2 1/4” Hex Screw, H.N., L.W. & F.W.
5 A010.050.0225 A010.050.0225 2 1/2”-13 x 2 1/4” Hex Screw & H.N.
6 A010.050.0250 A010.050.0250 2 1/2”-13 x 2 1/2” Hex Screw & L.W.
7 EC400.037 EC400.037 2 3/8”-16 Hex Nut
8 EC400.050 EC400.050 2 1/2”-13 Hex Nut
9 F601.037Y F601.037Y 2 Flat Washer
10 F620.037 F620.037 2 3/8” Lock Washer
11 F620.050 F620.050 2 1/2” Lock Washer
Models 5538-6538
Wheel Mounting Close Coupled
Ref.
No. 5538
Aluminum 6538
Cast Iron Qty. Description
1 P3320A P3320A 1 Towing Pole
2 P4779A P4779A 2 Stub Axle
3 P3327 P3327 1 Bumper
4 W27-4A W27-4A 2 Wheel 8” x 1.75” Semi-Pneumatic
5 W63-5133-75 W63-5133-75 2 Retaining Ring
6 A010.031.0225 A010.031.0225 2 5/16”-18 x 2 1/4” Hex Screw, H.N., L.W. & F.W.
7 A010.037.0125 A010.037.0125 4 3/8”-16 x 1 1/4” Hex Screw, H.N. & L.W.
8 A010.050.0250 A010.050.0250 2 1/2"-13 x 2 1/2" Hex Screw & L.W.
9 EC400.031 EC400.031 2 5/16”-18 Hex Nut
10 EC400.037 EC400.037 4 3/8”-16 Hex Nut
11 F601.031Y F601.031Y 4 5/16” Flat Washer
12 F620.031 F620.031 2 5/16”-18 Lock Washer
13 F620.037 F620.037 4 3/8”-16 Lock Washer
14 F620.050 F620.050 2 1/2”-13 Lock Washer
P2676 P2676 As Req’d Shim, Sl 25/64” X 7/8” X .015” Stl (Not Shown)
14