Simpson ALH3228-S Pressure Washer

This document provides detailed parts information, specifications, and diagrams for the Simpson ALH3228-S pressure washer.

Product Overview

The Simpson ALH3228-S is a pressure washer designed for demanding tasks. Key components include:

Model: ALH3228-S
Performance: 3200 PSI at 2.8 GPM
Engine: HONDA GX200
Pump: CAT PUMP, SVC ASSY PART NO. 7107589 (PUMP, CAT 4DNX25GSI)

The main assembly diagram (Page 2) illustrates the overall layout, featuring the main frame, engine, pump, handle assembly, and wheels.

Specifications

Integral Unloader

The integral unloader provides system pressure regulation and pump protection. It includes a fixed chemical injector.

Specification	U.S. Measure	Metric Measure
Flow	3.0 gpm	(11.4 lpm)
PSI Range	100-2850 psi	(7-196 bar)
Inlet Port	3/4" GHF	(3/4" GHF)
Discharge Port	M18 x 1.0	(M18 x 1.0)

The integral unloader diagram shows internal components such as the adjusting cap, spring, retainer, stem, piston, O-rings, and valve.

Integral Unloader Parts List

ITEM	PART NO.	DESCRIPTION	QTY.
402	7103842	CAP, ADJUSTING	1
403	7103843	NUT, LOCK (M18 X 1)	1
408	7103544	SPRING, PRESSURE	1
410	7103845	RETAINER, SPRING	1
412	N/A	STEM, PISTON	1
414	N/A	BACK-UP RING, PISTON STEM	1
415	N/A	O-RING, PISTON STEM - 70D	1
423	N/A	RETAINER, VALVE	1
424	N/A	O-RING, VALVE RETAINER (OUTER) - 70D	1
425	N/A	RETAINER, PISTON	1
426	N/A	WASHER	1
428	N/A	O-RING, PISTON RETAINER - 80D	1
429	N/A	O-RING, VALVE RETAINER (INNER) - 80D	1
435	N/A	Valve	1
436	7103846	SEAT	1
437	N/A	O-RING SEAT-70D	1
438	7101617	SEAT	1
439	N/A	O-RING, CHECK VALVE SEAT 70D	1
443	N/A	Valve, CHECK	1
444	7103048	SPRING, CHECK VALVE	1
446	7103851	O-RING, BODY - 80D	1
468	7103541	KIT, O-RING	1
469	7101616	INJECTOR, FIXED CHEMICAL	1
470	7106435	KIT, REPAIR (412, 414, 415, 423-426, 428, 429, 435-437)	1
471	7106436	KIT, REPAIR (438, 439, 443, 444, 446)	1

7332 FIXED CHEMICAL INJECTOR

The fixed chemical injector is integrated into the discharge manifold for chemical application.

Specification	U.S. Measure	Metric Measure
Flow	3.0 gpm	(11.4 lpm)
Nozzle Orifice	2.1 mm	(2.1 mm)
Hose Barb	1/4"	(1/4")
Inlet Port	3/8" NPTM	(3/8" NPTM)
Discharge Port	M18 x 1.0	(M18 x 1.0)
Weight	5.3 oz.	(0.15kg)
Dimensions	2 x 1 x 1.75"	(52 x 25 x 45 mm)

Chemical Injector Performance Chart

Orifice Size	Maximum Injecting Pressure	Maximum Chemical Draw	Pressure Drop Across Injector At System Pressure (2850 psi)
2.1 mm	250 psi	37.2 oz/min	141 psi

CAUTION: Deduct the pressure drop shown in the performance chart from your desired system pressure to arrive at the maximum high pressure nozzle rating. This is essential to avoid over-pressurizing the pump.

Main Assembly Parts List

This table lists the components for the main pressure washer unit.

ITEM	PART NO.	DESCRIPTION	QTY.
1	7107250	BASE FRAME, SVC ASSY W/ LABELS ALUMINUM	1
† 1.1		SUB-FRAME, ALUMINUM HORIZONTAL 11.75" С-С	1
† 1.2		BRACKET, AXLE HORIZONTAL	1
† 1.3		AXLE, Ø .625 X 20.10 (11.75" C-C FRAME)	1
† 1.4		BOLT, 5/16"-18 x 2 1/4"	4
† 1.5		NUT, 5/16"-18 NYLOCK	4
† 1.6		WASHER, SADDLE 5/16 X 1.0 X 0.060	2
† 1.7		BOLT, 5/16"-18 x 3/4"	1
† 1.8		TUBE, BASE FRAME 11.75 FORMED AL 2.0 WALL	1
† 1.9		PLATE, HORIZONTAL BASE FRAME, AL 11.75" C-C	1
† 1.10		NUT, WHIZ 5/16"-18	1
2	7108435	HANDLE, REAR SERVICE ASSEMBLY WITH LABELS	1
† 2.1		HANDLE TUBE, ALUMINUM 11.75" C-C	1
† 2.2		SCREW, TORX PANHEAD 1/4"-20 x 3/4"	4
2.3		7108142	DASHBOARD-NOZZLE HOLDER ASSEMBLY	1
2.4	7107067	HOLDER, NOZZLE 2PC RUBBER STRIP	1
2.5	7107068	HOLDER, NOZZLE 3PC RUBBER STRIP	1
3	100465	ENGINE, HONDA BLACK GX200T2QAPW NH1	1
4	7104174	KEY, SHAFT 3/16" x 3/16" x 1 1/4"	1
5	7107589	CAT PUMP, SVC ASSY	1
5.1	7106274	PUMP, CAT 4DNX25GSI	1
† 5.2		VALVE, THERMAL RELIEF 1/4" NPT(M)	1
† 5.3		FITTING, INLET GHT(F) X 3/8" NPT(M)	1
† 5.4		COUPLER, 3/8" QC-F x 3/8" NPTF`	1
6	7105013	WHEEL, SERVICE KIT	1
† 6.1		POWER WASHER WHEEL, 4" x 10" BLK W/ 5/8" BRG	2
† 6.2		WASHER, 5/8" FLAT	2
† 6.3		CLIP, E-TYPE 0.625" x 0.042"	2
7	7107262	FOOT KIT, SERVICE KIT	2
† 7.1		FOOT, RECESSED RUBBER INSERT	1
† 7.2		SCREW, PANHEAD M6-1.0 X 25MM PHILLIPS MACHINE	1
8	7103750	MOUNTING KIT, ENGINE	1
8.1		BOLT, FLANGE 5/16"-18 x 1 3/4" HHFB	4
† 8.2		NUT, WHIZ 5/16"-18	4
9	7107590	MOUNTING KIT, CAT PUMP	1
9.1		PLATE, KING BRUTE PUMP MOUNTING	1
† 9.2		WASHER, SPLIT-LOCK 5/16" RUST RESISTANT	4
† 9.3		BOLT, 5/16"-24 x 3/4"	4
† 9.4		WASHER, 3/8" SPLIT-LOCK	4
† 9.5		BOLT, 3/8"-16 x 1 1/4"	4
10	7103279	KNOB-BOLT ASSEMBLY (7103538, 7103563)	2
† 10.1		BOLT, SADDLE 5/16"-18 x 2"	4
† 10.2		KNOB, HANDLE 5/16-18	1
11	7105186	HANDLE GRIP, SIMPSON BLACK W/ WHITE LETTERING	1
12	7103743	NOZZLE SET, 3.0 5PC 1/4" OC-M	1
13	7108125	GUN, 4500PSI 3/8QC(M) INLET X M22(F) OEM	1
14	7103550	LANCE, 16" W/ 1/4"QC-F x M22(M)	1
15	7105645	HOSE, CRIMP MFG 5/16 X 25 X3600 2% PT QC	1
16	7102207	SOAP HOSE AND FILTER KIT	1
17	7102207	TOOL, NOZZLE CLEANING, UNIVERSAL	1
19	7107725	MANUAL, OPERATORS (ALHC 3228)	1
20	7107325	BOX, SHIPPING MULTI UNIT PLAIN KRAFT	1
		* NOT SHOWN
		* NOT SOLD SEPERATELY

Plunger Pump Models Parts List

This section details the components for the Plunger Pump Models 4DNX25GSI and 4DNX27GSI, FNA Part No. 7106274.

The exploded view diagram shows the internal workings of the pump, including seals, springs, retainers, and the pump head.

ITEM	PART NO.	DESCRIPTION	QTY
5	7103819	SCREW HH SEMS (M6 X 14)	3
8	7103820	COVER, BEARING	1
10	7102614	O-RING, BEARING COVER 70D	1
11	7102813	SEAL, OIL 70D	1
15	7102624	BEARING, BALL INNER	1
20	7103824	ROD, CONNECTING	3
24	7106430	PLUG, OIL CAP	1
25	7103826	CRANKSHAFT, 3450 RPM, 3/4" 6.8MM STROKE	1
25	7105354	CRANKSHAFT, 3450 RPM, 3/4" 6.3MM STROKE	1
27	7103828	BEARING, BALL INNER	1
32	7102604	CAP, OIL FILLER WITH O-RING	1
33	7102617	O-RING, OIL FILL CAP	1
37	7103056	GAUGE, OIL BUBBLE WITH GASKET	1
38	7102970	GASKET, FLATOIL GAUGE	1
48	7102787	PLUG, DRAIN	1
49	7102617	O-RING, DRAIN PLUG	1
53	7106425	CRANKCASE	1
64	7103830	PIN, CROSSHEAD	3
65	7103831	ROD, PLUNGER	3
70	7102804	SEAL, OIL CRANKCASE, 70D	3
90	7103542	PLUNGER CERAMIC	3
98	7101703	WASHER, SEAL	3
99	7103833	RETAINER, PLUNGER (M6 X 35)	3
100	7102925	RETAINER SEAL	3
106	N/A	SEAL, LPS WITH S-Spq	3
120	7106427	CASE, SEAL	3
121	7102610	O-RING, SEAL CASE	3
125	7106428	SEAL, HPS	3
160	N/A	O-RING, INLET SEAT	3
161	N/A	SEAT, INLET	3
162	7102945	BACK-UP-RING, DISCHARGE SEAT	3
163	7102946	O-RING, DISCHARGE SEAT, 70D	3
164	N/A	SEAT, DISCHARGE	3
166	N/A	Valve	6
167	7102923	SPRING	6
168	7102812	RETAINER, SPRING, INLET	3
169	N/A	RETAINER, SPRING, DISCHARGE	3
172	N/A	O-RING, VALVE PLUG - 90D	3
174	7106429	PLUG, VALVE WITH O-RING	3
185	7106430	HEAD, MANIFOLD WITH INTEGRAL REGULATORY BODY	1
188	7106431	SCREW, (M6 X 60)	6
197	7103839	ASSY, GH, 3/8"	1
249	7103840	ASSY, ADAPTOR MOUNT	1
255	7103841	ASSY, BOLT MOUNT	1
283	7106432	KIT, OIL DRAIN	1
300	7106433	KIT, SEAL (98, 106, 121, 125)	1
310	7106334	KIT, VALVE (160-164, 166-169, 172)	1