Hydraulic Equipment

Hydraulic Oil Analysis

Periodically test the hydraulic oil using an analysis kit, to check the hydraulic system for possible contamination. Simple, cost-effective hydraulic oil analysis kits are available through Manitou Americas.

Caution

Hydraulic oil contamination can severely damage the hydraulic system, which may not be covered under the product warranty.

Hydraulic Control Valve

The hydraulic control valve (U, Fig. 484) is mounted to the right side of the fire wall, directly behind the cab.

Control Valve - Standard-Flow Auxiliary Hydraulics

Control Valve - High-Flow Auxiliary Hydraulics

Resistance of control valve solenoids (A & B, Fig. 484) should be 5.0 - 5.6 Ohms at 70F (for code # 1116) measured between the two connector pins.

Main Control Valve Removal

NOTE: Cap or plug all hydraulic hoses, tubes, fittings and control valve ports immediately after being disconnected to prevent fluid loss and hydraulic system contamination.

NOTE: It may be necessary to loosen hydraulic tubes at the other end of the tubes connected to the control valve to provide some free-play.

1.Drain the hydraulic oil according to “Changing Hydraulic Oil and Filter” on page132.

2.Tilt the ROPS/FOPS up according to “Raising ROPS/FOPS” on page140.

3.Photograph the control valve before proceeding with removal to note connection/tube/hose locations for reassembly.

4.Disconnect the electrical connectors from the control valve.

5.Disconnect the tubes and hoses from the control valve.

6.Remove the screws fastening the control valve to the chassis and remove the control valve from the machine.

Main Control Valve Installation

1.If any fittings were removed from the control valve, replace them in the valve but do not tighten to allow for adjustment during installation.

2.Position the control valve on the chassis and secure with the screws removed during the control valve removal.

3.Connect the tubes/hoses on the control valve in the locations noted/photographed during the control valve removal.

4.Tighten any fittings that were left loose in step 1.

5.Fill the hydraulic oil reservoir according to “Changing Hydraulic Oil and Filter” on page132.

6.Lower the ROPS/FOPS according to “Lower ROPS/FOPS” on page142.