07011-00025 0701100025 HNBR PU FKM Carbon Filled PTFE Multi-Material Composite Oil Seal Kit for Bulldozer Transmission Parking Brake Valve Complete Overhaul Servicing D85A-18 D80A-12

1. Quick Details of  seal 07011-00025:

2. 07011-00025  parts on group :

NO.	PART NO.	PRAT NAME	QTY
1	154-40-00020	CONTROL VALVE ASSEMBLY	1
2	175-40-21111	HOUSING	1
3	175-40-21110	HOUSING	1
4	07043-30415	PLUG	2
5	07042-30108	PLUG	2
6	175-43-12140	COVER	1
7	175-43-12150	GASKET	1
8	01010-51025	BOLT	8
9	01602-21030	WASHER,SPRING	8
10	175-40-11321	SPOOL,L.H.	1
11	175-40-11133	SPOOL,R.H.	1
12	175-40-11150	VALVE	1
13	175-40-11140	SPRING	1
14	175-40-11161	SLEEVE	1
15	175-43-12180	BUSHING	2
16	195-40-11120	SPRING	2
17	175-43-12190	WASHER	2
18	04064-02012	RING,SNAP	2
19	175-40-11330	PLATE	1
20	01010-51030	BOLT	1
21	01602-21030	WASHER,SPRING	1
22	170-33-13530	STOPPER	2
23	07000-03025	O-RING	2
24	04065-03515	RING,SNAP	2
25	154-40-11190	LEVER	2
26	04010-00519	KEY	2
27	01010-50830	BOLT	2
28	01602-20825	WASHER,SPRING	2
29	154-40-11180	SHAFT,R.H.	1
30	154-40-11170	SHAFT,L.H.	1
31	04010-00522	KEY	2
32	170-43-12360	BUSHING	4
33	07046-14520	PLUG	4
34	07011-00025	SEAL,OIL	2
35	170-43-12380	COLLAR	2
36	01302-10812	SCREW	2
37	04059-01012	WIRE	2
38	175-43-12240	COLLAR	1
39	170-43-12321	LEVER	2
40	01010-51250	BOLT	2
41	01602-21236	WASHER,SPRING	2
42	170-43-12330	ROLLER	2
43	04205-01238	PIN	2
44	01641-21223	WASHER	2
45	04050-13020	PIN,COTTER	2
46	170-43-12120	TUBE	1
47	175-43-12120	TUBE	1
48	175-40-21122	SEAT	1
49	175-40-22521	GASKET	1
50	07000-03040	O-RING	2
51	07000-02014	O-RING	1
52	01011-51200	BOLT	1
53	01602-21236	WASHER,SPRING	1
54	07000-03028	O-RING	2
55	01010-51260	BOLT	12
56	01010-51285	BOLT	1
57	01602-21236	WASHER,SPRING	13
58	01643-31232	WASHER	13
59	195-33-11220	SPACER	12
60	175-40-22540	SPACER	1
61	154-40-11160	TUBE	2
62	07000-03022	O-RING	4
63	07000-03022	O-RING	2

3. 07011-00025  picture:

4. Service part number :

5. FAQ

Q: What exclusive performance advantages does the four-material composite formula bring to bulldozer transmission parking brake lock valve sealing compared with basic single NBR oil seal kits?
A: The bulldozer transmission parking brake lock valve stays under constant ultra-long static high lock pressure for most working hours, only releasing pressure briefly when restarting the bulldozer, enduring years of continuous static oil compression, occasional instantaneous pressure relief impact, and year-round erosion of transmission oil mixed with metal friction debris, water vapor and fine sludge penetrating into the closed transmission valve cavity. HNBR main parking brake spool and piston seals own far superior low-temperature flexibility and anti-permanent static high-pressure hydraulic oil aging performance compared with ordinary NBR rubber; they will not harden, crack or lose uniform radial pre-tightening elasticity under freezing plateau winter construction with weeks of continuous slope parking static lock pressure storage. Rounded rectangular PU buffer rings absorb instantaneous pressure relief surge spikes generated when unlocking the parking brake before vehicle startup, avoiding slow fatigue crack propagation and micro eccentric abrasion damage to double-lip spool sealing lips after millions of lock-unlock switching cycles. FKM thick static O-rings maintain consistent permanent static sealing tightness under prolonged high-temperature transmission oil storage inside the valve cavity during uninterrupted all-day heavy pushing work. Carbon-filled PTFE medium-gap backup rings deliver balanced wear resistance and medium-clearance anti-extrusion capacity, effectively preventing the main spool seal from being extruded into moderate clearance gaps between parking brake shuttle spool and valve body under long-duration static locking peak pressure. The four materials build a long-term static pressure holding + short instantaneous relief impact resistant multi-layer interlocking safety sealing system, raising the overall service lifespan of this oil seal kit by over 48% compared with traditional single-rubber oil seal kits.

Q: What clear color and structural visual differences allow maintenance technicians to quickly identify each precision component inside this transmission parking brake lock valve oil seal kit?
A: HNBR parking brake shuttle spool and lock balance piston main seals are matte jet black with symmetrical double-lip bidirectional dynamic sealing structure, the contact lip surface adopts nano mirror precision polishing without micro burrs or long-term static pressure cyclic abrasion scratches. Rounded rectangular PU static lock pressure buffer rings are pale apricot yellow with exclusive rounded rectangle shock absorption outline, which can be clearly distinguished from narrow oval, flat oval and trapezoidal PU buffer rings used on service brake valves, clutch control valves and small hydraulic cylinders. FKM medium thick static O-rings are dark coffee brown with thick uniform circular cross-section, no shrinkage or permanent micro deformation after months of continuous static high-temperature oil soaking storage. Carbon-filled PTFE medium-gap anti-extrusion rings are off-white with evenly scattered tiny black carbon particles spread across the flat surface, easy to separate from light gray graphite-infused PTFE rings applied to narrow-gap miniature pilot valve assemblies. The medium-duty double-layer dust wiper ring is medium-thick black with two layers of scraping lips; the outer layer intercepts large metal friction debris mixed in transmission oil, and the inner fine lip blocks tiny abrasive sludge particles from entering the valve spool gap. Each accessory is printed with clear parking brake lock valve matching dimension marks on the surface for rapid sorting and matching during on-site transmission valve assembly.

Q: What wide temperature range and long static lock pressure + short unlock relief impact hydraulic working conditions can this four-material composite oil seal kit sustain for long-term stable continuous operation?
A: This integrated oil seal kit can steadily bear sustained long-term static parking lock working pressure up to 422 bar, and withstand repeated instantaneous unlock relief peak impact pressure up to 478 bar without extrusion failure of sealing components. HNBR and PU components retain stable elastic recovery and long-duration static sealing performance within -38°C ~ +122°C, fully adapting to sub-zero frozen mountain slope long-time parking braking in winter and high-temperature continuous heavy pushing operation in summer. FKM thick O-rings can operate reliably within -26°C ~ +148°C, perfectly matching the ultra-high-temperature static transmission oil storage state of non-stop open-pit mine stripping construction. Carbon-filled PTFE medium-gap backup rings will not soften or deform under millions of intermittent lock-unlock spool sliding friction and persistent long-term high static temperature, maintaining consistent anti-leakage protective performance through all seasonal construction environments.

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