Checking The Manual Valve; Checking The Gear Housing; Checking The Reservoir; Checking The Filter - Yamaha 55DEHD Service Manual

Checking the manual valve

1. Check the manual valve 1. Clean the
manual valve if dirt or residue appears.
1

Checking the gear housing

1. Check the inside of the gear housing.
Replace the gear housing if scratched or
worm.

Checking the reservoir

1. Check the reservoir and O-ring. Replace
the reservoir and O-ring for deterioration
and corrosion.

Checking the filter

1. Check gear pump filter. Clean the filter if
dirt or residue appears.

Checking relief valve

1. Check the trim spring 1, up-relief valve
2 and down-relief valve 3. Replace the
trim spring if damaged. Clean the up and
down relief valve if dirt or residue
appears.
6885J11
68870890
1
3
2
68870870
2. Check the valve seal and valve seat.
Clean the valve seal and valve seat if dirt
or residue appears. Replace them if dam-
aged or worn.
3. Check the valve lock screw 4, ball 5,
washer 6 and main valve seal 7.
Clean the valve lock screw if dirt or
residue. Replace them if damaged or
worn.
7
Assembling the relief valve and
manual valve
1. Install a new O-ring 1 onto the valve lock
screw 2, then install the washer 3, ball
4 and main valve seal 5 into the PTT
body.
Then tighten the valve lock screw to the
specified torque.
5
Valve lock screw 2:
4 N·m (0.4 kgf·m, 3.0 ft·lb)
Gear pump
1
2
4
3
5
6
4
68870880
5
6
2
1
7
4
3
8
9
68870900
7-50