GROVE Published 1-20-2017, Control# 483-02 9-9
CD5515-2/YB5515-2 SERVICE MANUAL
3. To check for severe piston seal damage:
a. Fill the housing of hand pump with Mobil fluid 424,
or equivalent hydraulic oil.
b. Install the hand pump fitted with a 0 to 68.90 bar (0
to 1000 psi) pressure gauge to port B Figure 9-10.
NOTE: The hand pump MUST be filled with Mobil fluid 424
or equivalent hydraulic oil. System pressure is
37.90 bar (550 psi) DO NOT exceed 41.34 bar
(600 psi).
c. Use the hand pump to generate a pressure in the
brake piston housing.
d. If the pressure falls off rapidly, or if no pressure
reading can be obtained, the seals are severely
damaged and must be replaced.
4. If pressure falls off slowly, the piston seals may have
small cuts or nicks. To verify for small cuts or nicks in the
piston seals perform the following test:
a. Install an adapter fitted with a piece of clear tube
(approximately 120 mm (4.75 in) long to the brake
piston port B Figure 9-11.
NOTE: The tube must be kept vertical during the test. Use
tape to attach the tube to the side of machine.
b. Fill the tube until it is approximately three quarters
full with Mobil fluid 424 or equivalent hydraulic oil.
c. Using a suitable pen, mark the level line (C) of the
fluid in the tube.
d. After approximately 1/2 hour, check if the level has
dropped below the original marked line. If it has then
check the brake piston seals for slight nicks, cuts or
general wear.
5. Repeat steps 3 through 5 for the opposite brake piston
seals.
6. Reconnect all brake lines and bleed the brake system as
recommended on page 9-6.
SERVICE BRAKE REPAIR
Front Axle Brakes
NOTE: It is recommended that the axle be removed from
the machine when disassembling the front axle
brakes. See Servicing the Front Axle in Section 8.
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