PRINTED IN U.S.A 601-2 913241/BP0508
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Template Name: OML_2_col 0-00000
Template Date: 1994_04_22
GENERAL TEST PROCEDURES
WARNING
NEVER use your hands to search for hydraulic
fluid leaks. Use a piece of paper or cardboard.
Escaping fluid under pressure can be invisible
and penetrate the skin causing serious injury. If
any fluid is injected into your skin, see a doctor
at once. Injected fluid must be surgically
removed by a doctor familiar with this type of
injury or gangrene may result.
ALWAYS wear safety glasses when checking for
hydraulic fluid leaks. Escaping fluid can cause
permanent eyesight damage or loss if safety
glasses are not worn.
WARNING
Construction equipment can be dangerous if
improperly operated or maintained. This machine
should be operated and maintained only by
trained and experienced people who have read,
understood and complied with the Operator’s
Manual.
WARMING THE ENGINE:
Start the engine and run until the coolant
temperature gauge is in the normal operating range.
WARMING THE HYDRAULIC OIL:
1. Operate the attachment tilt, boom extend, boom
lift and frame leveling cylinders at the end of their
stroke for 30 seconds.
2. Repeat Step 1 until the hydraulic oil temperature
is at 120qF (49qC).
3. Operate boom and frame leveling functions 3 to
5 times in both directions to allow warm oil to
enter the circuits.
RS5/6-34 Telescopic Handler HYDRAULICS
HYDRAULIC SCHEMATICS, TROUBLESHOOTING, TESTING &
ADJUSTMENT PROCEDURES
INTRODUCTION
This section of the GEHL RS5/6-34 Telescopic
Handler Service Manual covers the hydraulic
schematics, troubleshooting, testing and adjustment
procedures.
A single section gear pump attached to the rear of
the transmission provides hydraulic flow to the
steering system and the flow divider. The flow divider
directs flow to the joystick control valves, the SAHR
(Spring-Applied Hydraulic-Release) park brake, the
(optional) PWP (Personnel Work Platform) valve and
the main control valve.
The joysticks are located on the right hand console
and direct the flow from the flow divider to the main
control valve spool control solenoids. The solenoids
shift the spools to direct the flow from the pump to
the boom lift, extension, attachment tilt and frame
leveling cylinders.
An electrical switch on the right side of the instrument
panel is connected to a solenoid that operates the
SAHR park brake. When the switch is OFF, the
SAHR solenoid is activated and flow from the flow
divider is directed to release the park brake. When
the switch is ON, the electrical signal to the solenoid
is switched off. The spring on the SAHR valve control
spool shifts the spool, blocks the flow from the flow
divider and directs the park brake hydraulic fluid to
the reservoir. The spring pressure inside the park
brake applies the brake.
The steering wheel is connected directly to the
steering control valve. When the steering wheel is
turned clockwise (right) or counterclockwise (left), the
steering control unit directs flow from the pump to the
steering cylinders. The steering mode valve control
solenoids are connected to a 3-way switch on the left
side of the instrument panel. When the switch is in
the neutral position, the flow from the pump is
directed to the front steering cylinder. When the
switch is in the 4-wheel mode or crab mode the
steering-mode Valve directs flow to or from the front
cylinder to the rear steering cylinder. The front and
rear steering cylinders are in a series hydraulic circuit
through the steering mode valve.
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