Gauge Requirements, Gauge Port Size And Location; Pressure Readings; Nominal Operating Pressures - Eaton Heavy Duty 2 Series Manual

Troubleshooting
Gauge
Requirements,
Gauge Port Size
and Locations

Pressure Readings

Nominal Operating
Pressures
(at Normal Operating
Temperature)
46 EATON Heavy-Duty Series 2 Hydrostatic Pumps Parts and Repair E-PUPI-TS004-E October 2004
46
Inlet Vacuum Gau ge
−30 to + 30 inHg (Mercury)
[−1 to + 2 bar]
(Compound Gau ge)
Inlet Vaccum
1−5/16 − 12 UN 2B
−16 SAE O−Ring Port
Customer Must
Supply Tee Fitting
(Not Shown)
Optional System Ga ge Ports (2)
9/16 18 UNF 2B − 6 O−Ring Ports
The pressures given in this manual are gauge pressures or delta pressures. A
pressure gauge reads zero when connected to atmospheric pressure. Any reading
above or below this zero point is referred to as gauge pressure (PSI). Delta pressure
is the difference of two gauge pressures in a hydraulic circuit.
For example:
Minus
Equals
Typical hydrostatic circuits usually include inlet pressure, case pressure, low or
charge pressure and system or high pressure. These pressures will vary per each
individual application and operating conditions.
Inlet Vacuum: Should not exceed 10 in. Hg. [254 mm Hg] (inches of
mercury) for an extended period of time
Case pressure: Should not exceed 40 PSI [2,8 bar] for an extended
period of time
Charge Pressure:* Neutral
Forward or Reverse
*Charge pressure relief valves are factory preset to their nominal setting with a 2 GPM [7 ,6 l/min]
flow rate. The original valve pressure will increase approximately 3 PSI [,21 bar ] per 1 GPM [3,8
l/min] additional flow over the valve. The charge pressures given above are typical. Higher charge
pressures may be set at the factory for your particular application.
PSI
Vac
Press
Charge pressure reading of 340
Case pressure reading of 20
Differential Pressure of 360 D PSI [23,4 bar]
System Pressure Gauges (2)
0 − 10,000 PSI [0 − 610 bar]
Charge Pressure Gauge
0 − 600 PSI [0 − 37 bar]
PSI
Charge Pressure
Gage Port
7/8 14 UNF 2B −
10 O−Ring Port
PSI [23,4 bar]
PSI [ 1,5 bar]
340 PSI [23,4 bar]
280 PSI [19,3 bar]
PSI
0