Disassembling The Relief Valve And Manual Valve; Checking The Gear Pump; Checking The Main Valve - Yamaha 55DEHD Service Manual

BRKT
Disassembling the relief valve and
manual valve
1. Drain the PTT fluid.
2. Remove the screws 1, trim spring 2,
up-relief spring 3, and then remove the
valve support pin 4, relief valve seal 5.
3. Remove the relief valve seat 6, O-ring
7, filter 8, valve lock screw 9, O-ring
0, ball q, washer w and main valve seal
e.
e
7-49
Bracket unit
1
2
3
4
5
68870830
9
0
6
q
w
7
8
68870840
4. Remove the circlip r, then remove the
manual valve t, manual valve seal y,
spring u, adapter i, spring o, manual
valve seal p and O-ring a.
p
o
i

Checking the gear pump

1. Check the drive gear 1 and driven gear
2. Replace the drive and driven gear if
damaged, scratched or excessive worn.

Checking the main valve

1. Check the main valves 1. Clean the
main valves if dirt or residue appears.
1
u
y
a
t
r
68870850
1
2
68870860
6S370250
6885J11