Hydro Repair - Bolens QS Series Service Manual

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DRIVE TRAIN (Continued)
HYDROSTATIC REPAIR
SUNDSTRAND HYDRO REPAIR
If trouble shooting and pressure
checks indicate a need tor disassem·
bly of the hydrostatic for repair,
the unit must be removed from
the tractor. After removal, the open
ports should be sealed off and the
external surface thoroughly cleaned
in a mild cleaning solvent. IMPOR-
TANT: Do not use a cleaning
solvent that is harmful to paint
or rubber.
To simplify the repair of the hydro·
static it will be discussed in four
basic sections:
1. Charge pump section
2. Pump section
3. Center section
4. Motor section
NOTE:
BEFORE DISASSEMBLY OF THE·
VARIOUS SECTIONS, A LINE
SHOULD BE SCRIBED ACROSS
THE TOP OF THE TRANSMISSION
SO THE PROPER POSITIONS OF
THE SECTIONS WILL BE MAIN-
TAINED DURING REASSEMBLY.
PUMP
SECTION
QS, QT
&
1900 SERIES
Page 3-11 REV. 12/78
MOTOR SECTION
J
SCRIBE LINES FOR
PROPER POSITIONS
DURING ASSEMBLY
FIGURE 3-14
HYDROSTATIC EXPLODED VIEW
1
Cap Screw
20
Acceleration Valve Spring 39
Hex Plug (Implement)
2
Bearing 21
Acceleration Valve Assembly 40
Snap Ring (Later Models)
3 Motor Housing 22
"0" Ring 41
Shim Pack
4
Thrust Plate
23
Hex Plug 42
Charge Relief Valve Spring
5
Motor Shaft
24
Center Section 43
Poppet Valve (Charge)
6 Cylinder Block Assembly 25
Pump Valve P'ate 44 Poppet Valve (Implement)
7
Check Valve Cap
26
Pump Shaft 45
Hex Plug
8 "0
1
'
Ring 27 Roll Pins
46
Filter Union
9
Spring
28
Pump Swash Plate 47
Implement Relief Valve Spring
10
Ball
29
Snap Ring 48
"0" Ring
11
Pipe Plugs 30 Bearing
49 Drive Pin
12
Gaskets
31
Snap Ring 30
Charge Pump (Gerotor)
13
"0" Ring 32
Pump Housing 51
Bearing
14
Back Up Ring
33
Control Shaft
52 Charge Pump Housing
15
Free Wheeling Valve
34
Bearing 53
Seal
16
Motor Valve Plate 35 Seal 54
Identification Tag
17
Pin 36 Washer
55
Cap Screw
18
Bearing 37 Retaining Ring
56
Hex Plug (Charge)
19
"0" Ring 38 Trunnion Shaft
LEGEND FOR FIGURE 3-15