maintenance
Forward/Reverse Hydraulic Pressure Test
1.Park the machine on a solid flat surface and stop the engine. Set the parking brake and block the front drum securely.
2.Check hydraulic oil level by viewing the hydraulic oil sight glass. The hydraulic oil level must be below the top and above the bottom of the sight glass. DO NOT OVERFILL!
3.Adjust engine RPM (3,500 +/- 50 RPM).
4.Let engine run for 5 minutes, this will bring the hydraulic oil operating temperature to a minimum of 135° F.
5.Check and repair all hydraulic leaks.
6.On the manifold block, install a 5,000 psi pressure gauge (Figure 29) to the forward pressure quick disconnect test port 2.
7.Run engine at full throttle.
8.Move the travel lever to the forward position. MAKE SURE FRONT AND REAR DRUMS DO NOT SPIN.
9.Read the pressure gauge. The relief pressure (roller drums blocked) will read 2,900 ± 145 psi. Under normal operating conditions this pressure will read
10.Return the travel lever to the neutral position and stop the engine.
11.Install the pressure gauge into the reverse quick disconnect port 3 and repeat the above procedures. The relief pressure reading for the reverse test port 3 will be the same (2,900 psi). Again normal operation pressure for the reverse port will be
12.Normal operating pressures are based on the machine traveling on level, firm surface.The operating pressures will increase significantly when traveling uphill.
Vibration Circuit Pressure Test
1.Place the front drum on soil, gravel, or a heavy rubber mat. DO NOT ACTIVATE VIBRATION FEATURE ON CONCRETE OR HARD SURFACE!
2.On the manifold block install a 5,000 psi pressure gauge to quick disconnect test port 1.
3.Start the engine and run at full throttle.
4.To start the vibration, press the pushbutton switch (vibration control) located on top of the travel lever. Under normal operating conditions this pressure will range between
NOTICE
Vibration relief pressure is hard to read accurately using this test. It may be necessary to disconnect the pressure line to the vibration drive motor. Plug this line and retest, pressure will be exact relief pressure. DO NOT perform this test for a long period of time — damage could occur.
Steering Pressure Test
1.On the manifold block, install a 5,000 psi pressure gauge into quick disconnect test port 1 (Figure 29).
2.Start the engine and run at full throttle.
3.Turn the steering wheel to the left or right (maximum) and hold. Read the steering relief pressure. The relief pressure reading for the steering test port 1 will be 700 psi. Again, under normal operating conditions, pressure for the steering port will be between
4.If maximum pressure cannot be reached, plug the steering cylinder pressure hoses and retest. If pressure is correct, the steering cylinder is leaking. DO NOT ACTIVATE THE VIBRATION FUNCTION WHILE PERFORMING THIS TEST!
Figure 29. Manifold Test Ports
page 26 — AR13HA/AR13HAR ROLLER (s/n 110301 & up) • operation AND PARTS manual — rev. #0 (06/22/11)
