To Next Page

To Previous Page

Page 3 - 12 TL49J

OUTRIGGER RAM

The outrigger ram is tted with two check valves. They require no adjustment. If the outrigger is not

holding under load, it is most likely that the check valve for the full bore side is leaking. The check

valves are difcult to get to as the block is tucked away on the underside of the ram.

• With the outrigger retracted, remove the rod pin.

• Swing down the outrigger to remove the cylinder.

• Both check valves are identical. Swap them over to determine if the cylinder stops moving.

The full bore check is performed to ensure that the outriggers stay down when the booms have been

lifted (#2).

The annular side checks are performed to enure that the outrigger remains vertical when towing the

machine (#1).

The restrictor is critical to prevent the outrigger from juddering when raising the outrigger to the

transport position. Do not replace with a non restricted hose adapter (#3).

PLATFORM CONTROL VALVE

The in-line check valve is found below the manual hand pump. The valve prevents the oil from ow-

ing back down the pressure line when operating the hand pump. The relief valve is set at 190 bar

and should be adjusted in accordance with the set up procedure.

To adjust the pressure, remove the cap of the relief valve and screw the adjusting screw inwards to

increase pressure and outwards to decrease pressure. Place the cap back after adjusting.

The spools are all the same and are closed centred in the neutral position. It is critical that the valve

block does not leak internally when in the neutral position. Note that there are two valve blocks with

each connected together at the lift cylinders. If the ground valve is not leak free with the spool in the

neutral position when operating the platform valve, the oil will not ow into the cylinder but leak out

through the ground valve. The same scenario applies for operating the ground controls when the

platform valve is leaking internally. This can also occur if the spool is not properly centralised by the

spring at the end of the spool.

In a situation where the ground controls function well but the operation of the boom from the platform

controls does not work, then the valve responsible for making the booms lift/lower is the faulty valve.

SERVICE AND REPAIR

Figure 3-8: Outrigger cylinder with welded on block containing the two check valves. The

restrictor shown is the hose adaptor tted in the outrigger control valve.

Courtesy of Crane.Market

Snorkel TL49J User Manual

Questions and Answers: