Disassembly And Assembly Of Hst Pump Assembly - Komatsu WA250-6 Shop Manual

SEN03856-00
Disassembly and assembly of
HST pump assembly
Special tools
Symbol Part No.
1 790-201-2720 Push tool
790-201-2150 Push tool
S 2
790-201-2830 Push tool
3 790-201-2740 Push tool
Disassembly
a If the pump body is disassembled, the assem-
bly special tool will be required. See "Assem-
bly 3. 5)".
a General view
1. High pressure relief valve assembly
1) Remove 2 high pressure relief valve
assemblies (1).
a Do not change adjustment screw.
a Control: O-ring and housing.
a Do not disassemble the high pressure
relief valve assemblies, except the O-
rings and backup rings.
6
50-500
Part name
q 1
t 1
t 1
q 1

Disassembly and assembly of HST pump assembly

2. Low pressure relief valve assembly.
1) Remove low pressure relief valve assem-
1
bly (2).
a Do not change adjustment screw.
2) Disassemble the low pressure relief valve
according to the following procedure, if
necessary.
a Before
screw, check the adjustment dimen-
sion.
1] Remove spring (3) and spring seat
(4).
2] Remove piston (5).
3] Remove locknut (6).
4] Remove adjustment screw (7) from
holder (8).
500 Hydraulic system
loosening the adjustment
WA250, 250PZ-6