Hydraulic System Tests Hydrostatic Drive System Pressures
Hydrostatic Charge Pressure Test and Adjustment
IMPORTANT: Start with a pressure gauge rated for a higher pressure than required, and move to lower-pressure gauges as needed. Gauges will be damaged if the pressure exceeds the capacity of the gauge.
The hydrostatic pump charge pressure test port (S, Fig. 525) is located under the ROPS/FOPS. On later machines, it is located on the right at the back of the pump. On early machines, it is located on the left near the front of the pump.
Table 18: Drive and Charge Pressure Values Later Machines
Value Parameter (measured at Note high idle) Model 1750RT/ 2100RT: 345 bar Hydrostatic Rated Relief (5000 psi) Pressure Model 2500RT: 400 bar (5800 psi) Right Reverse Pressure Model 1750RT/ Right Forward Pressure 2100RT: 362-369 bar Equal to: Left Reverse Pressure (5250-5352 psi) hydrostatic relief + charge Model 2500RT: pressure Left Forward Pressure 417-424 bar (6048-6150 psi) 17-24 bar Charge Pressure (300-350 psi)
S
Early Machines
NOTE: Install tee fittings as required to connect pressure gages. Gauge to measure charge pressure can be installed directly at charge pressure test fitting (V, Fig. 524).
Measure the values with the machine at operating temperature and at high idle. Carefully drive the machine against an immovable object, such as a tree.
S
Fig. 525 – Charge Pressure Test Port
CAUTION
1. Complete the mandatory safety shutdown Procedure. See “Mandatory Safety Shutdown Procedure” on page 22.
The machine has an extremely powerful track drive. Use extreme caution when driving the machine against an immovable object.
Printed in U.S.A.
287
50940165/C0718
