Determining Spray Tip Size; Drive System; Pulley Selection - General Pump Pressure Washer System Installation, Operation & Service Manual

DETERMINING SPRAY TIP SIZE

As stated earlier in this manual, the output pressure is
determined by forcing the output volume of water
through a certain size orifice or spray tip. Spray tip
size is a very important factor of proper pressure
washer performance, using a tip that is sized too
small will allow overpressurization of the pump and
components. You must know your output GPM and
your desired output PSI to properly select a spray tip
size. To use the chart on page 4, find the desired PSI,
read down the column until you find the output GPM
closest to your pump application. Read to the far left to
find the spray tip number and orifice diameter. Example:
1000 PSI at 4.0 GPM needs a number 8 spray tip.
Spray tips are available in various spray angles. It is
advisable to have different spray angle tips in the same
size for different cleaning applications. Some spray
tips or nozzles are available with an adjustable spray
angle.

DRIVE SYSTEM

There are three common methods of driving or
connecting the pump
drive and gear reductions drive require special
components that are matched to the pump and to the
motor.engine, as
considerations. A belt and pulley system is the
recommended method of driving the pump because
it allows easy reduction of the motor/engine RPM
to your required pump RPM, as well as absorbing
shocks produced by both the engine and the pump.
Pump Pulley
Outside Diameter
2-1/2 2-3/4
(inches)
2-1/2 1725
2-1/4 1574 1725
3 1431 1590 1725
3-1/4 1310 1460 1604 1725
3-1/2 1210 1346 1480 1615 1725
3-3/4 1125 1250 1375 1500 1625 1725
4 1050 1168 1283 1400 1518 1634 1725
4-1/4 985 1094 1201
4-1/2 926 1030 1131
4-3/4 876 974 1070
5 830 922 1013
5-1/4 788 875 963
5-1/2 750 834 917
5-3/4 715 795 875
6 685 760 937
6-1/2 630 700 771
7 584 648 713
8 507 564 620
9 450 500 550
10 405 450 495
11 366 407 448
12 336 373 410
13 309 343 378
14 286 318 350
15 267 297 326
16 250 278 306
and motor/engine.
well as other technical
PUMP PULLEY GUIDE (1725 RPM Motor)
3 3-1/4 3-1/2 3-3/4 4 4-1/4 4-1/2 4-3/4
1311 1420 1530 1640 1725
1235 1339 1440 1543 1650 1725
1168 1285 1362 1460 1558 1652 1725
1105 1198 1290 1382 1473 1568 1660 1725
1050 1137 1225 1312 1400 1487 1575 1662 1725
1000 1082 1167 1250 1333 1417 1500 1581 1646 1725
955 1032 1113 1192 1270 1350 1430 1510 1575 1650 1725
913 990 1065 1140 1217 1290 1370 1450 1509 1581 1653 1725
840 910 980 1050 1120
778 843 907 973 1039
676 734 789 845 902
600 650 700 750 800
540 585 630 675 720
488 530 570 610 652
446 485 522 560 596
412 447 480 515 549
382 414 445 477 509
358 386 415 445 475
333 361 389 416 445

PULLEY SELECTION

There are many types of belts and pulleys available,
the following is a basic guide. Manufacturer's
representatives should be consulted concerning your
specific requirements.
From the Motor Pulley Guide (below) determine the
pulley size (A, B or C section), and number and size
(A, B or C section) of belt required. the larger in size
and/or number of belts used will increase the life
of belts. Be sure to consider space limitations of your
finished assembly.
To Transmit:
HORSEPOWER
1
1-1/2
2
3
5
7-1/2
10
Direct
15
20
To determine pump pulley size (based on a 1725
RPM motor), find the motor pulley size on the chart
below, follow the column down until you find your
required Pump RPM to meet your requirements, or
the next higher RPM. Follow the column to the left to
find pump pulley diameter.
MOTOR PULLEY OUTSIDE DIAMETER (inches)
5 5-1/4 5-1/2 5-3/4
1190 1260 1330 1393 1460 1526 1592 1725
1102 1168 1231 1294 1355 1417 1500 1602 1725
959 1016 1072 1132 1186 1240 1312 1421 1509 1725
850 900 950 1006 1054 1102
765 810 855 906 949 992
692 733 774 823 863 902
634 671 708 755 791 827
584 618 652 697 730 763
540 573 605 647 678 708
505 534 564 604 633 661
473 500 528 566 593 620
5
MOTOR PULLEY GUIDE
"A" SECTION BELT "B" SECTION BELT
1 Belt 2 Belts 1 Belt
Single Double Single
Groove Groove Groove
Pulley Pulley Pulley
2-1/2 Dia - -
3 - -
3-1/4 - -
3-3/4 3 Dia 4-1/2 Dia
5-1/4 3-1/2 5
- 4-1/2 66
- 5-1/4 8
- 7 10
- 9 -
6 6-1/2 7 8 9
1166 1263 1342 1533 1725
1050 1137 1208 1380 1553 1725
954 1034 1098 1255 1411
875 947 1006 1150 1294 1438 1581 1725
807 875 929 1062 1194
750 813 863 986 1109
700 758 805 920 1035
656 711 755 863 970
"C" SECTION BELT
2 Belts 1 Belt
Double Single
Groove Groove
Pulley Pulley
- -
- -
- -
3-1/2 Dia -
5 -
5 -
5 8 Dia
6 9
7 10
10 11 12 13 14
1568 1725
1327 1460 1592 1725
1232 1355 1479 1602 1725
1150 1265 1380 1495 1610
1078 1186 1294 1402 1509`