HYDRAULIC SYSTEM TMS700E SERVICE MANUAL
2-34 Published 01-29-2015, Control # 512-01
CHECK VALVES
Description
There are two check valves utilized in the crane hydraulic
system. The check valves are used to block flow in one
direction and allow free flow in the opposite direction.
The crane’s hydraulic dual return circuit has an in-line
plumbed check valve in one of the two return lines. It is used
to force hot return oil in the other return line to the hydraulic
oil cooler.
The swing directional control valve has a check valve
installed in its outlet port to ensure there will be enough
pressure to force oil through the port anti-void check valves
for motor over run when the directional control valve is
centered.
Maintenance
Removal
1. Tag and disconnect the hydraulic lines from the valve.
Cap or plug the lines and ports.
Installation
1. Connect the hydraulic lines to the ports on the valve as
tagged during removal.
2. Verify proper operation of the valve. Check hydraulic
connections for leaks.
HYDRAULIC REMOTE CONTROL VALVE
Description
The crane has four single axis hydraulic remote control
valves (Figure 2-23). Each valve has a control lever for the
operator’s use.
The four hydraulic remote control valves are single function
type valves. Moving the control lever forward or back
operates the selected function. Two valves are located in
each armrest. The valves in the right armrest control the
main hoist and boom lift. The valves in the left armrest
control swing and telescope.
If the crane has an optional auxiliary hoist, the auxiliary hoist
function replaces the telescope function on the control lever
on the left armrest. Instead, the telescope function is
controlled by a pedal operated single function control valve.
The pedal is on the cab floor. The control valve is mounted
on the left rear underside of the cab and is connected to the
pedal by linkage.
When the armrests are up, the crane function switch is off, or
the operator is not seated, the controller lockout valve is de-
energized and the functions are disabled.
Maintenance
Armrest Control Valve Removal
1. Gain access to the base of the control valve by raising
the armrest and removing the plastic cover screwed
onto the bottom of the armrest.
2. Tag and disconnect the hydraulic lines to the control
valve. Cap or plug the lines and ports.
3. Remove the bolts securing the control valve to the
armrest. Remove the control valve.
Armrest Control Valve Installation
1. Place the valve on the armrest. Secure the valve to the
armrest with the attaching bolts.
2. Connect the hydraulic lines to the valve as tagged during
removal.
3. Install the plastic cover on the bottom of the armrest.
Secure it with screws, washers and nuts.
Armrest Control Valve Functional Check
1. Start the engine and run it at normal speed.
2. Move each control lever to operate the function
controlled by the corresponding control valve. Verify
proper operation of the hoist motor, swing motor, lift
cylinder, and telescope cylinder (or auxiliary hoist
motor).
3. Check valve and lines for leakage. Make repairs as
needed.
Telescope Pedal Control Valve Removal
(with Auxiliary Hoist Option)
1. Disconnect the pedal linkage from the control valve by
removing the pin and cotter pin.
2. Tag and disconnect the hydraulic lines from the control
valve. Cap or plug the lines and ports.
3. Remove the four bolts and washers securing the control
valve to the mounting bracket. Remove the valve.
Telescope Pedal Control Valve Installation
(with Auxiliary Hoist Option)
1. Place the valve on the mounting bracket and secure in
place with the bolts and washers.
2. Connect the hydraulic lines to the valve as tagged during
removal.
3. Connect the pedal linkage to the control valve with the
pin and cotter pin.
Reference Only
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