Service manual

Replenishing Valve Function
The functions of the replenishing valves are:
HYDROSTATIC SYSTEM INFORMATION
When making repairs on hydrostatic and
hydraulic systems, clean the work area before
disassembly and keep all parts clean. Always
use caps and plugs on hoses, tubelines and
ports to keep dirt out. Dirt can quickly damage
the system.
I–2003–0284
1. To give replacement fluid to the low pressure side of
the hydrostatic circuit. Replacement fluid is needed
because of normal internal leakage and the
controlled flow to the oil cooler for cooling; Function
1 [A].
2. To keep high pressure fluid out of the low pressure
side of the hydrostatic circuitry; Function 2 [A].
Tow Valves
The loader can be moved for a short distance when the
tow valves are open.
Turn the two valves open one half turn before moving the
loader [B] [C].
NOTE: After moving the loader with the tow valves
open, make sure the two valves are
completely closed and tight because they
have a direct effect on the operation of the
loader drive system.
A
B–02804
CHARGE OIL
Valve Moves for Charge
Oil Replacement
Valve Stays on Seat to
Hold High Pressure for Drive
FUNCTION 1
FUNCTION 2
B
CD–11194
C
CD–11195
–3–4–
853, 853H Loader
Service Manual