SERVICE MANUAL
separate pump components as shown in
Fig.
244.
Use care to avoid damaging
machined mating surfaces and gear
pockets of pump bodies. Do not remove
high pressure adjusting screw
C24J;
screw
is staked
in place and setting should not
be changed.
Check all parts for evidence of wear or
damage and renew as necessary. If
pump housings show evidence of wear
or scoring in gear pocket area, complete
pump must be renewed.
To reassemble, reverse the disassem·
bly procedure while noting the following
special instructions: Be sure pressure
seal
(8)
is installed into wear plates
(9)
first, then install back-up gasket
(7).
Seal side of wear plates must face away
from gear faces. Omit high pressure
relief valve spring
(22)
when assembling
pump bodies, and use tie bolts to draw
bodies together
over dowel
pins. Then,
remove tie bolts and separate end cover
(23)
from spacer plate
{21).
Install retain
ing washer and high pressure spring
(22),
position end cover on pump and
tighten retaining screws and nut to
27
N ·
m
(20
ft.lbs.) torque.
If low pressure relief valve (items
1
through
5)
was removed from pump
body, tighten adjusting screw
(1)
until
spring is bottomed, then back screw out
four turns. This should set relief valve
opening pressure w1Lhm spec1fied range
of
4480-5515
kPa
(650-850
psi).
A
suitable hand pump with pressure gage
can be connected to Multi-Power circuit
outlet port to check opening pressure if
desired.
High pressure relief valve adjustmg
screw
{24)
should not have been turned
during disassembly. However, if parts of
relief valve were renewed, it will be
necessary to readjust valve setting after
pump is reinstalled. Hydraulic lift cover
must be removed to gain access to relief
valve adjusting screw. Maximum system
pressure should be
15860-17925
kPa
(2300-2600
psi).
AUXILIARY VALVE
All Models Except MF250
235.
OVERHAUL. To disassemble
valve, remove snap ring
<
16
-
Fig
.
245)
and end plug
Cl5).
Loosen detent
assembly
(2)
adjusting screws, then un
bolt and remove end cap
OJ
from valve
body. Withdraw spool assembly from
spring end of valve body.
NOTE:
Valve spools are selective fitted to
their body bores and must not be inter·
changed. When servicing dual spool valve,
Identify spools as they are removed to en·
sure correct r
ea
ss
e
mbly
.
Paragraph
235
Fig. 245-EKploded view of dual spool auKIIIary valve assembly used on some models.
1
End cap
7 Body
13
�le,ve
19
Uuode
2 Detent usy
8 Check valve
14
"0
r
o
n
�
20
Pin
3 Inner rod
9
Spool
16
Plug
21
"0"
rona
4
Outer
lever
10
Reaulator auy
16 Snap rong
22 P,n
5 Inner lever
II Slee,_.
17
.Sylon
""rtv.
23 Cuode
6 Swotch valve
12 Spnna
18
Sprong
24
·o
'
nnR
Fig. 246-EKploded view of
aulllllary valve assembly used
on Model MF250. Detent
piston (12) Is not used on
ear-
ly production valves.
S Ad.Juatong screw
l Inlet cover
2 Control lever povol
3 Songle double act1ng
convertor valYe
4
Check valve
5 Outlet cover
6
Detent rehef
valve
7 Val-. apool
8
Povot bracket
9
Woptr ..
al
10
"0"
r1ng
II Cage
12
Pilton
13
Spnng
14
Detent
balls
15 Carner
16 ''0"
nngs
17 End plate
IS Spnng
seats
19
Centenng "''Ting
20 Spaeer
21
Reta1n1ng acrew
22 End cap
91