Operating Instructions
3. Cap fitting on cylinder heads if not using pilot valve for continuous run port.
4. Make sure there is a 1/4” copper tube (unloader tube) installed from tank check valve to unloader on
pressure switch. This relieves head pressure when compressor stops for easier restart. See figure 2.
5. Use proper pulley for motor. Refer to Pulley Size Chart for correct sizing.
6. Install belts. There should be 1/2” slack for proper belt tension. See figure 3.
7.
Use a flexible connector between compressor tank and piping system to minimize noise, vibration, unit
damage, and pump wear.
Pulley Size Chart
(Pulley size in inches)
Pump
Model No.
Electric
Motor - Hp
1750 RPM
4 Pole Motor
3450 RPM
2 Pole Motor
Gas Engine
Hp
Gas Engine
Pulley Size
APP2V0313S
3
5.5
2.75
5.5
3
APP3Y0518S
3
5.5
2.75
6.5
3
APP3Y0518S
5
5.75
2.75
6.5
3
APP3Y0521T
5
7
3.5
8
3.5
APP2V0732S
5
5.5
2.75
8
3
APP2I0524T
5
7.7
3.8
11
4
APP3Y0732T
5
6
3
11
3
APP3Y0732T
7.5
7
3.5
13
4
APP4V1043T
7.5
6.4
3.2
13
3.2
APP4V1043T
10
8.8
4.4
18
4.4
APP3Y1544T
10
9
4.5
24
4.5
APP3Y2062T
15
9
4.5
28
4.5
APP4V2598T
20
9
4.5
40
4.5
APP4V2598T
25
11.5
5.8
50
5.8
NOTICE
Splash lubricated pumps require 550 RPM for proper lubrication. Be
sure to size motor and engine pulleys correctly.
6
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