Pressure And Flow Test - jcb 214e Service Manual

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Section F
55 - 2
Synchro Shuttle Gearbox
Torque Converter Stall Test
Ensure that the engine and transmission are at normal
working temperature. Run engine at maximum speed and
check the No Load Speed (High Idle Speed - U.S.A). See
Engine Technical Data for correct figure; adjust if necessary.
Apply parking brake and footbrake firmly, select 4th Speed
Forward and open throttle fully. Engine speed should be as
specified at Torque Converter Stall in Transmission
Technical Data. Select Reverse and repeat test.
Note: When fully engaged, the parking brake electrically
disconnects the transmission drive; this prevents the
machine from being driven with the parkbrake on. Therefore,
so that we can complete the test, move the parkbrake lever
fractionally forward until the warning light is just
extinguished; hold the lever in this position for the duration
of the test. DO NOT move the lever too far forward,
otherwise the parkbrake will not be fully operational.
Alternatively, disconnect the switch at the park brake.
DO NOT stall the converter for longer than 10 seconds or
the transmission fluid will overheat.
If engine speeds are higher than the stated figures check the
transmission for clutch slippage or internal leakage.
If engine speeds are below the stated figures either the
engine is losing power and should be serviced/overhauled or
the torque converter reaction member clutch is slipping. To
check the engine, select Neutral, open throttle fully and
operate an excavator service to ' blow off' the main relief
valve. Engine speed should fall to slightly above the
Maximum Governed Speed (see Engine Technical Data). If
engine speed is correct the torque converter is faulty.
Note: Maximum Governed Speed is a datum figure only. It
cannot be adjusted or checked with the engine installed in
the machine.

Pressure and Flow Test

Note: The tests must be carried out only in the following
order, step by step.
! WARNING
Take care when disconnecting hydraulic hoses and
fittings as the oil will be HOT.
Trans 1-2
1 Stop engine, remove transmission filter and filter head
adapter. Fit adapter A (892/00920) into the gearbox
casing. Fit test adapter B (892/00301) and secure with
adapter C (892/00302).
(892/00229) as shown and connect a 0-20 bar (0-300
lbf/in2) pressure gauge to test connector E (see Service
Tools, Section 1).
9803/3280
Transmission
Service Procedures
Connect flowmeter
Purchased from www.WorkshopManuals.co.uk
Start engine and run at 1000 rev/min. The flowmeter will
2
show the Pump Flow which should be as shown in
Technical Data. A low reading indicates a worn pump
or blocked suction strainer. The pressure gauge will
show the Main Line Pressure (see Technical Data). A
low reading can be caused by either a faulty pressure
maintenance valve or a worn pump. A high reading
indicates a faulty pressure maintenance valve or, if the
pump flow is low, the oil cooler may be blocked.
3 Stop engine, remove flow test adapters and refit filter.
Connect pressure gauge and flowmeter into converter
out line as shown at F. Run engine at 1000 rev/min with
transmission in Neutral and note Converter Out
Pressure and Oil Cooler Flow, which should be as
shown in Technical Data. A high pressure together with
low flow could be caused by a blocked oil cooler. (See
also check 7.)
4 With parking brake and footbrake firmly applied, select
Forward and check flow reading, which should not fall
by more than 4.5 litres (1 UK gal; 1.2 US gal) per
minute. A low reading indicates a high leakage rate in
that particular clutch, which could be caused by worn
or broken piston seals or shaft sealing rings. Select
Reverse and repeat the test.
If the clutch leakage rate is high, the Clutch Pressures
5
may be checked by connecting the pressure gauge into
ports G and H and repeating test 4. A low reading (see
Technical Data) would confirm a high leakage rate in
the particular clutch selected.
6 Stop engine, connect the pressure gauge into port J in
the transmission, and fit a load valve L into the
converter out line (see note).
Note: Make sure that the load valve L has been screwed
fully out before starting the engine, otherwise the converter
seals will be damaged.
Start engine, run at 1000 rev/min and slowly screw
down the load valve whilst observing the gauge
reading, which should rise to the setting of the
Converter Relief (Safety) Valve (see Technical Data).
DO NOT allow the pressure to exceed 10.3 bar (150
lbf/in 2 ) or damage to the converter seals will be caused.
If the reading is higher than specified, the relief (safety)
valve must be faulty. A low reading indicates a faulty
relief (safety) valve, leaking converter 'piston ring' type
seal or leaking pump seal.
Stop engine and connect pressure gauge and
7
D
flowmeter into return line from oil cooler to transmission
as shown at K. Start engine, and with transmission in
Neutral check flowmeter reading, which will show the
Cooler Flow Rate (see Technical Data). The pressure
gauge will show the Lubrication Pressure (see
Technical Data). Low flow and pressure readings could
indicate a blocked oil cooler.
Section F
55 - 2
Issue 1