Yanmar 4JH2E Service Manual page 225

Chapter 7 Reduction and Re>"ersing Gear
4. Operation and MainJenance
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~4JH Ser~s
4.7 Driving plate
SPring
Steel ball groove
Parallel pin
Pressure plate----,'-tol•/
sliding surface
'""'
Steel ball/
0
(1) Check the key groove for scoring and cracking, and the
output shaft fitting section for burning. Repair if the
damage is light and replace the driving plate if the
damage is heavy.
(2) Outside diameter of pressure plate sliding part; others
Outside diameter: D
D
Standard
"68.366 ~ 68.440
(2.6915
~
2.6944)
(3) Steel ball groove wear and stains.
mm(in.)
Wear limit
"68.3
(2.6889)
(4) Determine the amount of wear and play of both the axial
and circumferential direction pins.
(5) Permanent spring strain.
Spring free length
(6) Pin end wear.
Standard
32.85
(1.2933)
mm(in.)
Wear limit
32
(12598)
7-10
4-8 Retainer
(1) Check for stains and damage on the friction plate con-
tact surface.
(2) Check for wear and cracking on the plate spring contact
surface.
(3) Measurement of dimensions
~
f-
d D
Standard
d
"67.060
~
67.106
(2.6401 ~ 2.6419)
D
"75.9
~
76.0
(2.9881 ~ 2.9921)
t
4.95 ~ 5.05
(0.1948
~
0.1988)
4-9 Plate spring
(1) Permanent strain
mm(in.)
Wear limit
"67.3
(2.6496)
"75. 7
(2.9803)
4.8
(0.1889)
mm(in.)
Standard Wear limit
7.2 ~ 7.6 7.05
H: when plate spring
is free (0.2834
~
0.2992) (0.2775)
4· 1
O
Thrust collar
The gear side of the thrust washer has a 0.3mm (0.0118in.)
copper sintered layer. Replace the thrust collar when the
thickness is less than 5.75mm (0.2263in.) (Standard
thickness: 5.9
~
6.0mm (0.2322
~
0.2362).
Pn"nted in Japan
AOAI 029-9002