TM 5-3805-280-24-2
Hydraulic System
HYDRAULIC OIL CLEANUP PROCEDURE USING PORTABLE FILTER CADDY
1. Install new return filter elements.
5. Start the engine and run it at fast idle.
NOTE: For a failure that creates a lot of debris,
IMPORTANT: For the most effective results,
remove access cover from hydraulic tank.
cleaning procedure must start with
Drain hydraulic tank. Connect filter caddy
the smallest capacity circuit then
suction line to drain port. Add a minimum of 19
proceed to the next larger capacity
L (5 gal) of oil to reservoir. Operate filter caddy
circuit.
and wash out the hydraulic tank.
6. Starting with the smallest capacity circuit, operate
each function through a complete cycle.
IMPORTANT: The minimum inside diameter for a
connector is 13 mm (1/2 in.) to
Repeat procedure until the total system capacity
has circulated through filter caddy seven times.
pump.
Each function must go through a minimum of three
complete cycles for a thorough cleaning of oil.
2. Put filter caddy suction and discharge wands into
hydraulic tank filler hole so ends are as far apart as
Hydraulic System Filtering--Specification
possible to obtain a thorough cleaning of oil.
Capacity ................................................... 270 L (71 gal) approximate
3. Start the filter caddy. Check to be sure oil is flowing
Time ............................................................... 43 minutes approximate
through the filters.
NOTE: Filtering time for complete hydraulic system is
Operate filter caddy until all the oil in hydraulic tank
0.158 minute x number of liters (0.6 minute x
has been circulated through the filter a minimum of
number of gallons). Filtering time for machines
four times.
with auxiliary hydraulic functions must be
increased because system capacity is larger.
Hydraulic Oil Tank Filtering--Specification
7. Stop the engine. Remove the filter caddy.
Capacity ................................................... 148 L (30 gal) approximate
Time ............................................................... 13 minutes approximate
8. Install new return filter elements.
NOTE: Filtering time for hydraulic tank is 0.089 minute
x number of liters (0.33 minutes x number of
9. Check oil level in hydraulic tank, add oil if
gallons).
necessary. (See Hydraulic Oil in Group 0004.)
4. Leave filter caddy operating for the next step.
33
3360
20
TX,33,UU3780
1921SEP981/1
21-62