Assembly process No.
M-7
Flushing of hydraulic circuit, and bleeding air from hydraulic cylinders (Part 1)
After the assembly work is completed, flush the hydraulic circuit and bleed air from the hydraulic cylinders. a When performing the assembly process No. M-6 to M-9, the assembly process No. A-21 "Bleeding air from hydraulic cylinders" can be neglected. However, the air bleeding mentioned in assembly process No. A-12 "Installation of blade" and A-9 "Installation of ripper" must be performed. a Never run the engine at high idle to avoid the damage to the flushing elements. a If from the beginning the engine is run at full throttle, or the cylinders are operated to the end of their stroke, the piston packing may be damaged, so never operate in this way. a Check the oil level, and add oil to the specified level if necessary. 1. Flushing of fan circuit 1) Check the oil level in the hydraulic tank. (Check that the oil level is between "L" and "H" of the sight gauge. If it is not between "L" and "H", add oil.)
2) Start the engine and run it for approximately 10 minutes at low idle. 3) Then run the engine for approximately 30 minutes in 1,000 to 1,200 rpm. 4) Check the oil level in the hydraulic tank. (Check that the oil level is between "L" and "H" of the sight gauge. If it is not between "L" and "H", add oil.) 2. Bleeding air and flushing of cylinder with piston valve (blade lift cylinder) 1) While running the engine at low idle, extend and retract the cylinder for 5 minutes. However, do not move the cylinder to the stroke end. a Operate the piston rod to approx. 100 mm from the end of the stroke; do not relieve the circuit under any circumstances. 2) Keeping the engine at low idle, retract the cylinder to a point approx. 100 mm before the end of the stroke, then use fine control (at least 10 seconds) to retract the cylinder to the end of its stroke. While operating the lever, hold the cylinder in this position for 3 minutes. 3. Bleeding air and flushing of cylinder without piston valve (Blade tilt cylinder, ripper lift cylinder, ripper tilt cylinder) 1) Check the oil level in the hydraulic tank. (Check that the oil level is between "L" and "H" of the sight gauge. If it is not between "L" and "H", add oil.) 2) While running the engine at low idle, extend and retract the cylinder for 5 minutes. However, do not move the cylinder to the stroke end. a Operate the piston rod to approx. 100 mm from the end of the stroke; do not relieve the circuit under any circumstances.
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